SSJ4 is the best thing GT gave fans, but Vegeta’s latest SSJ3 form in DAIMA manufactured a major obstacle for it becoming ...

And even then, Super Saiyan 4 levels the playing field between him ... basically turning it into a Kaioken-esque attack while depriving Goku of one of his most useful transformations.

but this form is said to be about as powerful as Super Saiyan Blue Kaioken, not on the level of Ultra Instinct. Finally, there is also a question of how Ultra Instinct would be handled in Dragon ...