I dunno, people seems to be making a big deal about the GCD penalty, but I don’t think it will matter much. I’m confident those who will benefit most from the one-button assist are not the sort who were hitting their attacks at the speed of the GCD anyway, or who might fidget to find the right part of their rotation to continue from after moving out of fire on the ground (if they move out of fire at all).
It was never going to be the ideal way to play for top end players, but (I think) will drastically raise the performance floor for a lot of more casual players. This, I hope, will put a lot of people into a position where they can perform at a reasonable level in content that would otherwise be a huge pain to carry them through. That’s all I want out of it, anyway.