The problem is, Trek doesn’t entirely embrace the multiverse approach (each has a different quantum signature) and instead embraces a sort of unfolding approach. Sometimes you get bubbles...which makes sense from a conservation of energy way of thinking. Small bubbles (like the time loop the Bozeman gets stuck in, even smaller from the enterprise perspective) sometimes you get huge ones (city on the edge of forever, the universe as a result of the trial in all good things) where the universe might take eons to curve back onto its ‘natural’ path (or not all...in which case, it is essentially destroyed and replaced entirely. A popped bubble.) The rules of time travel, as presented in Trek, do not support skipping grooves and timelines as such...hence, Gabriel Bell ends up literally being Sisko, but it nudges the universe back on track. There’s a bubble where he didn’t look like sisko, but since the entirety of history is unaffected by the simple change (due to sisko playing the role) it just carries on as it was. That’s why the KT has to be a different universe (and is...because otherwise, future Shatner Kirk is present in its 20th century, S is future Janeway, both from incompatible futures. And Picard..and everyone tbh. There’s a lot of time travel. The enterprise that helps Gary seven save the Earth in the sixties doesn’t exist in kelvin Trek, so it would destroy itself and create a paradox. Picard can’t save first contact there, because he would die at verifiable three without Shatner Kirk. But that’s ok, as the Borg wouldn’t stop it, because it never happens, because Gary Seven fails so...everyone join in the O’brien Mantra now please....) being interfered with not by time travel, but by cross-universe travel. KT is a mess of damaged info from Prime, in exactly the same way the MU is by the time of DSC.
It’s easy. Every other Trek is Prime, because that’s the way it’s unfolded, in universe and production wise. Is DSC a bubble? Could be. The changes could be. Is ENT a bubble? Highly likely.
That made my head hurt.
