Success does not equate with musicianship. Doh!
Can you easily play Twinkle Twinkle little star, or Old MacDonalds got a farm, or the Alphabet song or even Baa Baa Black Sheep on DJ equipment? If that's a stretch, how about Donna Lee? Autumn Leaves?
The DJ's equipment is a performance tool, regardless how adept they are.
I'm sure some DJs are very talented, and may be very musical, but they're not playing chromatic musical instruments.
The vast majority of music is realised with CHROMATIC instruments, OK, y'all?
Hah, call me old fashioned