“For instance, isn’t it true that Kanye West can neither play any traditional instruments nor sing? And Jeff Koons has apprentices actually make his sculptures.”
I’m not sure these examples help your point… A lot of popular music hasn’t relied on instrument or voice skill for, what, 30 years, give or take? Someone can make great, and successful, popular music using other skills; they’re still skills. And the same for contemporary art - the named artist might be a great draughtsperson but could still create brilliant art without demonstrating that. Neither West or Koons are unskilled, untrained amateurs in their field in the way a complete non-photographer snapping with their iPhone is.