I think one of the issues with "damage already done" is that we have already seen that the current actions leading up to the Avengers beating of Thanos was "enforced" as the proper timeline.
So, this may be useless nitpicking, or it could be rather important, so I'll engage in the nitpick.
If I recall correctly, Mobius does not say that beating Thanos as they did was "enforced". They do not say that the TVA had to take action to make sure it happened. Mobius said words to the effect that those events transpired "as they should have."
1) It is possible that the TVA doesn't care about most actions. For example, they may not care about whether you have chicken salad or a BLT for lunch. The bulk of your personal actions are just minor components of the overall statistics of billions and trillions of beings, and you are perfectly free of will within those statistics. The graphic they showed of an alternate timeline going "to the red line" supports this idea. There is an allowed region in which the universe is allowed to exist. The only "enforcement" the TVA needs to do are on actions that go outside the allowed bounds, and create persistent alternate timelines. Since Captain America put all the toys back where they came from (just like Cap, to clean up his room, right?), the TVA doesn't have to enforce anything. They still had choice, but just happened to make choices that were all fair game, from the TVA's point of view.
In this form, the TVA is really no different than any other regulatory body. Sure, there are some things you aren't allowed to do, but for the most part people are
incapable of those actions, and only a few folks have to be constrained if they make bad choices. Loki bucking the system is an act of CN self-interest. What happens to the plebeians is irrelevant, but
LOKI will not be constrained!
2) An alternative is that what the TVA has done is create a
deterministic universe, that will run to its completion in a known manner so long as there is no outside influences. Unfortunately, in doing so, they didn't actually eliminate all outside influences - the TVA
itself is an outside influence, for example. And that raises the question of what outside influence led to Loki's escape with the Tesseract?
In this form, the TVA has removed all free will from the trillions of sentient beings in the universe. They are villains, and Loki is a straight up hero for opposing them.
And, I suspect they'll never tell us which of these is the case,
especially if Mobius is Loki, because that would make the character
simple.
