Quantum mechanics is pretty well established, and we may suppose that it describes everything (at least, in low gravitational fields). Given that, pointing at a thing and saying “quantum mechanics!” adds no new information.
Are you making this argument?
P1: Quantum mechanics is well established.
P2: Quantum mechanics describes everything in low gravitational fields.
C1: So, calling a thing a “quantum system” doesn’t convey any information.
I think this (implied) mode of reasoning can be pretty useful. For example:
Sally: A ghost just turned my television on again!
Tom: Ghosts aren’t real, so that’s not what happened.
But I’m like 75% sure that American political parties do exist (i.e., the correct ontology of the universe includes political parties alongside electrons, minds, and trees). I’d like to hear @Elizabeth’s argument against this.