I disagree; I think that's the BEST way to determine what genre a game belongs in. Trying to assign various requirements is what causes so much debate in the first place because any single detail can be incorporated into any genre, but it's the package as a whole and the feeling it gives off that defines a game. I think we're smart enough to know an RPG when we see it, but second guessing comes in when people start saying "well... this game has stat building and that game has leveling up and so-and-so game has so-and-so, so... maybe they should be considered RPGs?" It's about identifying the dominate gameplay elements and the overall feel. Your gut knows best.