Yeah, but in most worlds, you don't get hundreds (or even dozens) of different magical animals "awakening" just as many different teams of magical girls, in regards to just as many different magical kingdoms or what-have-you. Just by the fact that they're that prevalent, the vast majority of them almost have to be fake in one respect or another.
(Yes, it'd be possible to write a world in which there are that many and they're all genuine. If this one were like that, though, the negative consequences of the early magical-girl teams having not stopped their corresponding enemies would almost certainly have become manifest by now, with such visibly drastic consequences that Ranma wouldn't be doing that anymore. Since this hasn't happened...)
(Yes, it'd be possible to write a world in which there are that many and they're all genuine. If this one were like that, though, the negative consequences of the early magical-girl teams having not stopped their corresponding enemies would almost certainly have become manifest by now, with such visibly drastic consequences that Ranma wouldn't be doing that anymore. Since this hasn't happened...)