However, this isn't about the people or even their musical backgrounds and skills etc.. It's about the classification of the *outcome* (=the music) of those factors and the boundaries it exists within. Do you acknowledge that such boundaries do exist? How then does the genres not exist when they are in fact defined by said boundaries?

And what's the difference/conflict between listening to what's going on in the music and checking off a list of what should be found in the supposed genre? You do the former when your'e listening and then use the information you gathered doing the former to do the latter in the context of a discussion about the relevant genre, it's not hard work...