Exhibit A for the defence: this utterly masterful set by garage legend DJ EZ. He deftly plays with the build and release of tension without relying on formulaic drops. There is still enormous creative mileage in traditional two-deck mixing.
https://www.youtube.com/watch?v=OraL6lKoyXE
Selectors don't even mix in the traditional sense, nor do they compose or produce, but there's a tremendous art to what they do. If you're unfamiliar with sound system culture and clashing, I'd suggest the Red Bull Culture Clash as an accessible introduction, particularly Rebel Sound's 2014 performance starring the inimitable David Rodigan. It's worth watching the "making of" documentary on their performance; it took months of painstaking preparation to play 40 minutes of music.
https://www.youtube.com/watch?v=KKDSgMddOO0 https://www.youtube.com/watch?v=8ishaG9pyMA
The problem as I see it is that technology has made DJing too accessible. Every two-bit hipster with a Macbook thinks that they're a DJ. Back in the day you needed decks, you needed to learn to beatmatch, you needed to hunt down white labels, you needed to get dubplates cut. There was a barrier to entry, an apprenticeship you had to serve before you could call yourself a DJ. The term has now been diluted to the point of meaninglessness, but that doesn't diminish from the artistry of great DJs.