Been over a year since I played but if I remember correctly, the boss doesn't have any H-attacks or defeat scenes. I remember being disappointed about that.
FInished the game, the bosses indeed do not have the animations, but the gallery has the apparent defeat scenes, though I've never seen them in game (maybe due to mashing buttons and skipping them instantly).
Well, I liked the game, even if it felt clunky, anything I should check out after completion? Mods, secrets or the like? I visited the opened doors at the hub.