"It is not really a subject in which you can be either "right" or "wrong"."

If you like Italian food, you 'can' put Jalapenõ peppers in it if you choose......at home. If you want to open an Italian restaurant, you need to know that there is a reasonably narrow 'accepted' way, else your customers may not come back.

Right & wrong may not be the operable terms, but clearly defined terms for the general public are quite important.
(I suppose that in a restaurant, you could offer Jalapenõs 'on the side' for those few who wanted to experiment, but in a concert or on a CD, everyone gets the same recipe, and if they do not already know what to expect from a performer, they can be unpleasantly surprised. I know *I* have been!. After hearing & enjoying several 'Celtic' bands like Ossian and Battlefield, I went to a concert by The Tannahill Weavers, with driving electronic bagpipe and ¾ of everything LOUD!...I need categroies!)