batistabus wrote:Migatte no Gokui is all about optimization. When you're at a point where your physical movements are limited by the amount of time it takes you to translate a thought into an action, the only way you can improve is to act without that extra step. Because Saiyans increase their level of strength through transformation, in order to have access to that level of power in addition to the optimization, Goku "transforms" (white hair) when utilizing the form.
In other words, MnG is one's/Goku's maximum sustainable power and optimal battle sense rolled into one. It is the ultimate achievement in martial arts, and it is a reflex that can only be drawn out through making fighting second nature and being pushed to one's limits. It has been foreshadowed heavily in the manga this arc, and has been teased since Resurrection F. I think it's one of the most interesting concepts in Super.
It still leaves a lot of questions unanswered though.
I like the idea as presented by RF - as a technique that was semi-plausible (the part about nerve signals was silly as those are actually really slow compared to our heroes but whatevs), giving Goku/Vegeta a new area to improve in over time (as Beerus showed partial mastery was a thing) and a way to get better that didn't require a new transformation.
But the UI Omen and 'full' UI forms don't feel very similar to that. After arcs of seeing Goku make no progress toward that skill, he breaks out a new transformation that has it attached by being pushed in a fight, and while it originally has the issue of not being 'complete', Goku just keeps getting pushed into the form until he completes it. And then it has crippling drawback that takes it off the table for the time being.
And we never learn why it is a transformation for Goku, when it just appears to be a skill for everyone else. We have no idea what that form is, because it's not sufficient to say it's ultra instinct when it works differently to how that technique is portrayed. It's functionally just another power-up to match a really strong guy blow for blow, which is a disappointing use of the concept.
Your explanation for why Goku transforms would potentially work, but it hadn't been offered by the series and doesn't match everything we'd been given. If transforming were a byproduct of Goku learning to use UI, that'd be a neat idea, but from what we've been shown Goku's transformation just
gives him UI as a property of the form.
Ideally, Goku and Vegeta would actually learn how to use UI bit by bit (like Beerus has been) rather than Goku going from 0 to 100% (or 0 to 50 to 100% with Omen involved) in a single arc. A rudimentary UI could have assisted Goku in dealing with Hit's abilities, or the Black arc battles. Give it a presence in the earlier arcs and have the transformation be the climac of its ongoing development, not a sudden revival and breakthrough of the concept.