why are game genres so badly named
RPGs are rarely about role-playing and far more about experiencing a story (particularly JRPGs; WRPGs and cRPGs are more focused on the RP part of the RPG)
FPSs aren't necessarily about shooting and being first-person, they're about reflexes and fast-paced action. just going by the name alone, Metroid Prime (very clearly a metroidvania) and Portal (very clearly a physics based puzzle game) would be FPS games, which they really don't fit in with the rest of