Characters don't actually "fly" in the game, they just levitate few cm above the ground and can do very long jumps, like in DOS 2.
The practical difference is that, for instance, you can still hit in melee a "flying" character or creature without a problem, while conversely in Solasta you'd need to use a ranged attack OR set your melee with a "ready action" waiting for the flying creature to come close enough.
