Oh, my apologies, I wasn't meaning to suggest it was *misleading*, just a bit miscategorized. You are right though, there are incrementals that don't have a prestige, either at all or because the "reset" is something forced on you (see games like Increlution, Groundhog Life, Progress Knight, etc)
I think it's also a little fuzzier because it's an RPG, so there has to be *something* seperating the two genres for sanity's sake, but it's hardly a formalized thing!