kawavladjazz/fusion/classical musicians are by far at the top of the game mentally/dexterously and if you disagree you literally have no fucking idea what you're talking aboutAll_Over_RSall the best session musicians came from jazzlol
That's proly because its a really elitist environment and the standards are astonishingly high. Doesn't mean you can't find the same level of skill in other genres.
That said, genres are just conventions, an attempt at defining whats already been created, it's just a rough guideline. You're mistaken if you think music is about mechanical prowesses or the ruleset you use to compose a piece.