The wiki treats U7 as low 2-C so they don’t consider overarching timelines as a contradiction
Yeah, hence why I'm bringing it up here.
Refer to CR post. Though, I'll elaborate a little more on it. Given the anime elaboration of this is rather lacking, we can try using the manga to potentially give us some more details on this whole idea of time-traveling that Toriyama has going on. In it, it's explained that going to an arbitrary point into the past creates an alternate world, this being not of the actual, 'past or future' of the Timeline they currently reside it, that does not affect the actual, 'past, present, and future' of the timeline itself. Whis has an ability for that whenever he's rewinding time, and no Time rings comes from that. Hints, why Bulma refers to this as an Alternate world for Future trunk's timeline, and not, "the future", or in vice-versa, where the main timeline is not the actual past of Trunk's timeline, but an alternate world that moves congruently when time passes.
Whis applies this same thing for future trunks timeline, going into an arbitrary point into the future that happens before their fight with Zamasu to sell him away. This directly causes a new time ring to come about, and why Beerus refers to it as, "You're going to create another parallel world!"
This same thing happens in the anime, where Beerus is complaining about making a new time-ring from Whis doing this (Causing a new parallel world to come about that's talking about before Trunk's own world events came about.), and Whis rebukes him about how Beerus also made a new time ring.
Simply put, if this was just Whis reversing the events of Trunk's already existing timeline- No new time ring would appear, but this is not the case confirmed by Beerus and Whis interaction in the anime (and supported by the manga), so therefore, Whis created a new parallel world that's not the same as Future trunk's timeline. Hints, why they're 6 time rings after the fact.
Yeah, fair enough, then. I concede that Zeno did destroy Trunks' whole timeline, in this case.
So, after skimming through this thread:
Goku is completely incapable of going to any Universe without the need of Whis, despite being able to instant transmission to any spatially disconnected place (So long as the Ki signature is strong enough. He can already sense beings Universe distance across at Ssj2 Gohan level. They're plenty of people in the other Universes that he can instant transmission to, yet he doesn't.)
This is honestly the most solid argument I've seen so far, so, I'll leave it alone for now and focus on the others.
The reason for this is that Universe 7 by itself has already been shown to contain parallel space-time continuums within its globe, such as the Room of Spirit and Time, which is still affected by time travel; which proves that the new timelines can encompass other space-times as well, and thus the events in the Future Trunks Saga don't prove anything in the way of the universes being physically connected.
We already know the Hyperbolic Time Chamber is a disjointed Space-Time from the the Space-Time of U7 within Kami's lookout. Similarly, there's an all encompassing Timeline in Dragon ball, that has disjointed Space-Times (In this case, the lookout)
I don't see why the Room of Spirit and Time suddenly proves that the universes are each their own separate spacetime. The idea of timelines embedded within larger timelines is not abnormal at all, and we acknowledge it as a possibility in any verse, so the effect being demonstrated by an actual location doesn't really help your argument at all. You'd need evidence that refer specifically to the 12 Universes to conclude that they're separate spacetimes, especially now that people finally realized their interpretation of the cosmology is potentially Low 1-C and not 2-C, so it'd obviously be analyzed under much stricter standards.
Not to mention that, as far as I am aware, the RoSaT is just a planet-sized pocket dimension with a compressed flow of time compared to the normal world, which doesn't require alternate spacetimes to begin with, seeing as how this phenomenon happens in real life, too, though to much lower degrees, obviously. So, this point doesn't seem to hold up, regardless of how you look at it.
As for this whole Infinite Zamasu thing, he embodies the Space-Time of Universe 7 (By him being capable of affect other Timelines by his being and not using any external source to Time travel). I'll argue that Zeno destroyed just Zamasu (And the whole U7), and not the whole Timeline - We know this because his actual guards were never erased, and the time ring was still there
This seems to be arguing that Zeno only destroyed the U7 of Trunks' world, rather than the whole timeline, which you all seem to have changed your minds on, and which I already agreed to, so, it seems like it doesn't really matter anymore.
I believe reason why timeline is Low 2-C is not because of uncountable snapshots(there is no way to know how many snapshots are there in a timeline)
"snapshots" is just the term I use for the lower-dimensional cross-sections of spacetime, of which there are uncountably infinitely-many by necessity, since space and time being continuous and defined over the field of the real numbers is the standard assumption, both here and in physics as a whole. So, yeah, the "snapshots" are a direct result of the extra axes.
Now..I dont see why a bigger spatio-temporal dimension encompassing space and time continums result in a presence of extra temporal dimension rather than just bigger 4D space and time continum in case of time ring
Also isn't hypervolume used to measure volume of 4th spatial shapes like tesserect but not 4D space and time continum?
Hypervolume is just a measure of the amount of higher-dimensional space encompassed by any given object, and it applies to any construct, be it a tesseract or a timeline. A spacetime continuum that extends infinitely across all axes is a bit different in that it doesn't exist as an object to be measured within a n-dimensional space: It
is the field of measurement itself, and thus its hypervolume is ∞, and it cannot be meaningfully embedded within a space of the same dimension. If anything, it'd only be a subset of that space insofar as every set is a subset of itself, but both of them would still have the same size, and neither would be larger than the other.
That's why, for an infinitely-extended timeline to be contained in an overarching flow of time, the latter would have to be a higher temporal dimension. But if the timeline is finite, it the latter could indeed just be a space with a bigger hypervolume.