They break the game, for fuck's sake.
Farming remnants is ridiculously easy and is pretty much the late game content. After you farmed them, it gets easier and easier and more profitable. You won't ever need to do anything else.It's a ridiculous end for the game's learning curve.
Then make your suggestion: make a NPC that gives you anything you want for free.You just wanna have some fun after all.
Nerf your brain.
So it is doing something wrong. And IMHO, it is the complete lack of anything else to do late game than farming Remnants, Unity and grieving.