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None of that proves that Domain barriers nullify techniques themselves absolutely preventing even their activation. Not every barrier will do the same thing either, Simple Domains and Curtains for example have different functions, the former neutralizes the barrier of a Domain to null the guaranteed hit, the latter reveals cursed spirits and prevents outside viewers from seeing what's happening inside. The shared feature between all barrier techniques though is that they can be imbued with conditions.hey real quick I don't think that it’s the domains per say that are neutralize the CT's but the barrier instead, because we do see examples of what happens when there is no barrier to hold your opponent in during the domain expansion, with Gojo being able to use Red while the malevolent shrine is still going is because the barrier is opened and not closed which allows Gojo to still use his CT or during regie vs Megumi fight where regie was able to use his CT that can be chucked up to the fact that Megumi’s domain is not fully complete and has no barrier what so ever meaning there is nothing to nullify (let follow into) the cursed tech meaning that regie could use his cursed technique unabated since again no barrier to prevent regie from doing so. Then the example with Dagon we see that Naobito and Nanami can use their cursed techniques in the domain but that only happens when the barrier is tampered with by Megumi opening up his own domain inside of Dagon’s so them using their CT's doesn’t contradict power null.
There is also the fact that Tangen has explained that her barriers are what allows the creation of current age barriers and many cursed techniques meaning that barriers are able to mess with CT's no matter how you slice it and this is further amplified by how Tangen’s barriers are explained in the verse and what they exactly do
The barriers created by Tangen allow for the creation and use of other barrier techniques with greater effectiveness to the point where if she wasn't there and her barriers where gone the sorcerers would have to re learn barrier techniques from the Heian era and due to her barriers also optimize cursed energy as a whole throughout Japan allowing people to actually become sorcerers and use cursed techniques and energy with greater ease with only those with the utmost efficiency and talent being able to become sorcerers without those barrier as can be seen by the statement that outside of Japan the number of sorcerers is extremely low.
This is further strengthened by the explanation provided by Kusakabe when it comes to Domain amplification
Domain amplification basically creates a pure/empty barrier around the user allowing for their cursed technique to flow into the barrier messing with its actual effectiveness or in cases of low output techniques flat out nullifying them as a whole.
To put it into concise package it isn't domains themselves that provide powernull but the barriers that make up the domains with barrier techniques being able to mess with the flow of cursed energy and even allowing for cursed techniques to be thrown out of wack as a whole and the reasons we see CT's being used in some domains is due to 1 of 2 factors either the barrier is compromised or it is an open/none existent barrier(Sukuna, Kenny/Megumi) with the compromised barrier it’s pretty simple but with the other two is a bit more complex. Basically, let’s use the whole "paint on air" way of talking about open barriers, when you use a closed barrier domain you are basically trapping your opponent on the canvas of a painting and while they are on that canvas they are entirely under your jurisdiction unable to use their own paint (CT's) while if you are painting on the air the opponent is not trapped within a canvas and can throw their paint at you.
So, to conclude we could just make an addendum to JJK's revisions/pages that its specifically barriers that powernulling abilities and not domains themselves with closed domains basically being the pinnacle of jujutsu and barrier techniques.
Sukuna was able to activate Ten Shadows to summon Mahoraga inside of Yorozu and Gojo's Domains too.
