While i like prosthetics and combat arts, and think they are mostly useful (in selected situations, and depending on play style, clearly), i can't say the same for objects in this game.
Much like SoulsBorne, the constant autosaving means that using an object that can't be infinitely bought or refilled indefinitely, is to throw it away, 90% of the time.
This just pushes you to never even consider using stuff like Parsimmons and similar "rare" items, because you'll probably die anyway, and just might as well learn to do the boss without 'em.
It's just such a stupid design choice.
I'm fine with having only 1 of X rare object in the whole game, but if i die in any one attempt, i should get it back at least.
The way it is now, you just throw it in the pile of "too rare to use" items, and eventually get so good, that they wouldn't make a difference anyhow.