Subject says it. Can't vault prisms, can't reset rank if inventory is full of prisms, have nothing to spend prisms on if inventory is also full of golfballs, and can't vault golfballs. Don't have anything worth masterworking that isn't already. Add to that the stupidly low storage limits on these things and it's another example of Bungo treating player QOL like crap. And add to that the inability to dismantle a brick at a time of Mod Components, which can be vaulted but are pretty much worthless in large amounts. Malice or stupidity? Your call...