I'm a lot better now at using Barret, Tifa, and Aerith. Those 6 person challenges force you to git gud and I love it. Synergy skills across the board seem overpowered to different degrees, they deal decent damage and charge ATB for two characters simultaneously. But they're very much needed to "insta-teleoprt" your teammates and have them saved from high damaging enemy attacks, coz all they do otherwise is keep blocking.
Finished the UPA Musclehead Colesseum challenge on Hard last night using my main team (I gave up on it in Normal, but now I'm good enough to beat it on Hard, ha!). Speaking of the UPA... the G-Bike challenge's target score is glitched and cannot be beaten. My literal final side quest is bugged, how fucked up is that?
One thing where Rebirth's system totally outshines Remake's is how it encourages you to use uncommonly-used abilities/skills, determental effects, and dispel. I didn't find myself needing these in Remake. They can be gamechanging here and turn "unbeatable" challenges beatable. Little things like using Iron Defense against certain annoying attacks are immensely satisfying.
