I really like the MCH rework even if its feels slighlty incomplete and has a few issues. I'm surprised they didn't pull inspiration from Edgar and the like earlier.
I also really like Gunbreaker. I find it really fun to play with excellent mobility and the damage combo is actually fun to do unlike the other tanks stuck doing 1-2-3 to do everything.
I think they could go a long way in turning previous FF characters into classes as they have turning Squall and Seifer into the Gunbreaker. It was rather nostalgic reading ability names and having a vague recollection of hearing it before and then using blasting zone on a mob and realizing what it actually was.
I can only Imagine a Thief class based off Zidane now using those double sided swords.