This still won't deter those from saying it's in first person and you shoot, therefore, first person shooter. I don't get how the Prime series, which are very unique from other first person titles, can be labeled so easily to some. To me, FPS is a label specifically given to games with a shooter focus.
I agree. It's why Oblivion isn't labeled an FPS despite the ability to go into the first person and engage in combat with short and long range weapons.
MGS: Twin Snakes had an FPS mode, guess what, they don't call that an FPS. And shooting is a focus on that game!