Weird, I beat everything but the last optional superboss (Simon) in hard (the difficulty before max) and it's not like I learnt character combos much. Yeah I did learn enemy movesets, sorta, but I always dodged, fuck the parry. Enemies did hit my characters a lot and almost half the turns were spent reviving them, but the revives recover post fight so it's whatever.

I did reach a point where Maelle and Verso were so strong that enemies hardly got a turn though.