If somebody writes an easy to understand explanation of the arguments here so far, I can ask our staff members to evaluate it.
Alright, my main problems (besides the other scaling stuff that it's only relevant in relationship with the Greater Grail) is this from the OP:
Being the pathway to the Root that utilizes it’s connection to the Origin to grant wishes, i
This is not correct. The process of Wish Granting is not tied to the process of reaching the root via the Holy Grail War ritual. First, there is the quote used in the OP, and repeated in the thread over and over again as a justification lacks a lot of context.
"No. First of all, there's only one administrated land in Japan that can activate a sorcery.
I know the ley line in Fuyuki is first-class, but there's not enough distortion to connect to the origin."
"Right. It's not distorted enough to reach the origin. That's why you make a hole. If the path is obstructed, you have to destroy the wall yourself, right?"
"The Holy Grail War is the process of destroying the wall.
The process accumulates enough magical energy to grant any wish. But that's just a secondary matter for the Einzbern family. And it was also an advertisement to call for the Masters, the sacrifices."
Here, Illya is explaining the process where the Greater Grail connects to the Root.
But the Greater Grail doesn't merely punch a holy into the Root for any of its effect. The process is a lot more complex.
First, it requires the souls of Heroic Spirits to be stored inside of it.
"The Great Holy Grail administers the system of the Holy Grail War. The Holy Grail collects the souls of the defeated heroic spirits and acts as the reactor core to activate the Great Holy Grail."
Then, the souls are released, and the Greater Grail then process to take advantage of the souls of the Heroic Spirits escaping and returning to their original place.
"And once the Holy Grail collects enough souls to activate the Great Holy Grail, it uses the heroic spirits' souls to open a hole.
The Great Holy Grail fixes the small hole created when the heroic spirits return to their original place after their roles are fulfilled. This opens up the passage to the origin that humans cannot reach."
How many servants are needed for this process? Seven souls. Without those, the Greater Holy Grail
cannot accomplish this function:
This Holy Grail is real. If you insert seven Servants in it, it will reach the origin" - FSN: UBW Day 15
Marisbury
The Greater Grail will be filled with the souls of seven Servants, and the Magical Reactor Core used to reach the Root will activate. - FGO: Salomon Singularity
Even the, Root is not reached immediately. The distance is still too far, but the Magi has energy for their journey.
"Of course, this is just the first step.
Your wish isn't granted even if the hole is opened. The path to the origin is too far."
"But
the one who obtains the Holy Grail gains access to unlimited magical energy.
The other side has large quantities of unused mana unlike anything seen on this side. For an ordinary magus, it's nothing short of a miracle."
"Of course, this is just the first step. Your wish isn't granted even if the hole is opened. The path to the origin is too far."
The importance of the souls of the Heroic Spirits is central to the ritual. The Holy Grail was is just an excuse to the get the souls of the Heroic Spirits to come down to be harvested for the ritual:
"Yes, it summons the heroic spirits as Servants.
But you need an incentive to summon the heroic spirits. They won't heed your call unless you give them what they want.
That's why the Holy Grail was prepared to reward them."
"…Well, that's a deception from the start.
The Einzberns just wanted the souls of the heroic spirits.
They didn't care about their rank. They just wanted strong souls.
To hide that fact, they created the Holy Grail War as a cover. They deceived the Servants and Masters and made them kill each other."
The souls of the Heroic Spirits are key to this ritual, since they are the ones that exist on the 'outside' that the Einzbern want to reach and transcend the Time Axis:
"Right. In the ritual of the war, Masters are mere receptors to summon the Servants. Once they've done that, they can die at any time.
The heroic spirits are the only ones needed to complete the Holy Grail.
Heroic spirits are pure souls separate from the time axis. Though they are outside of this world's logic, they can still influence it."
"That's the power they needed.
They tried to exit into the outer world using that power.
That's the real purpose of the Holy Grail in this land.
The Holy Grail Wars were waged to create a phenomenon, a miracle, that is still out of human reach."
Full scene:
https://lparchive.org/Fatestay-night/Update 364/
So from all of this we get that the Greater Grail is doing quite a lot of work in order to reach the Root. It is a very specific function, very complex and not related to Wish Granting or all of the functions of the Grail, such as recreating worlds like we see the Fuyuki Grail do in the Apocrypha Event or the Saber Alter Interludes. Also, it requires to harvest the souls of the Heroic Spirits, which are the ones actually travelling to the outside, and the Greater Grail is using their escape to fix the hole that they make and make it travesable. Even then, it is just the start of the journey.
Furthermore, the distinction between the Wish Granting and making a pathway to the Root is further proven when we see that the Wish Granting can be done by the Greater Grail without activating that function, and with less than the 7 required servants harvested to make the path. Just six servants harvested and no pathway opened to the root is enough to make it already an omnipotent wish granter:
Yes, it should let you grant any wish. It contains more magical energy
than a magus could ever use within his lifetime.
That is why it is better with more sacrifices. It should be omnipotent
with six Servants as sacrifices.
Five Servants have filled the Holy Grail. Only one more is needed for
the omnipotent grail they sought." - FSN: UBW Day 15
Marisbury had the Greater Grail filled with 6 souls, but refused to sacrifice Solomon, the seventh servant, and both Solomon and Marisbury made a wish upon the grail
without connecting to the Root:
Marisbury
Wonderfully done, Caster.
We have eliminated all six of the other Masters.
Marisbury
We have won the Holy Grail War. Once I use my Command Spell to make you kill yourself, the ceremony will be complete.
Marisbury
The Greater Grail will be filled with the souls of seven Servants, and the Magical Reactor Core used to reach the Root will activate.
Marisbury
And then, the Third Magic shall finally take form.
Marisbury
The Third Magic is the materialization of souls.
Marisbury
Humanity shall escape the shackle of the physical body, be released from all suffering caused by its “limitations,” and advance to a new stage.
Marisbury
You are a sacrifice for that purpose.
I am sure you understand, Caster.
I nodded in agreement. Humanity's salvation and growth were not the tasks given to me.
IfI had no reason to stop them. Just as it was during my life, I simply did what was required of me.
In the Fuyuki Holy Grail War, there would be no Servant survivors.
All Servants were to be eliminated. Even I, the victor, was fated to commit suicide, compelled by my Master's Command Spell.
Marisbury
...No, that was a joke. I'm kidding, Caster.I'm sorry. I got overexcited.
Marisbury
I have no intention of offering my meritorious partner to the Greater Grail. I won't use my Command Spells, either. They wouldn't work on you anyway. - FGO: Salomon Singularity
This Greater Grail was not to be used to reach the Root, but to grant one man's wish. - FGO: Salomon Singularity
Furthermore, both Illya and Marisbury remark that the Holy Grail War was
not actually intended to use the Wish Granting function:
The process accumulates enough magical energy to grant any wish. But that's just a secondary matter for the Einzbern family. And it was also an advertisement to call for the Masters, the sacrifices." - FSN: Heaven's Feel day 15
Marisbury
To grant one's desire...
Marisbury
Yes, how ironic. The end result is turning out to be just the kind of nonsense the original ritual's creators promised. - FGO: Salomon Singularity
The Greater Grail is still impressive, as I said it can simulate entire worlds, change the world even affecting the foundations of the Human Order (by rewritting history or even undoing the separation between the Reverse Side and the Surface), but it makes no sense to escale a very specific function that requires a lengthy and complex to all of its actions or those of its terminals.
Thus this massive upgrade ends up being lubricous since its based on a quote that forgets the rest of the process and the other instances and mentions of Wish Granting preformed by the Greater Grail unrelated to it.
Sieg and Angra should have a "1-A via Reality Warping" rating added, as well as Reality Warping and acess to all of the Nasuverse's powers (although for the record utilizing this is severely out of character, so that should be added in a weakness)