It's a youth thing in my opinion.
Kids today, and by that I mean anyone younger than 25, just don't get it.
The idea of wanting, or even riding anything over 10 years old baffles them.
Bike mechanics should be taught the basics, then move up.
Now I'm not a mechanic but there is very little I would not be capable of doing on a bike (I'm just slower and lacking the trade tricks). I started on side pulls as a kid, went onto cantilever then V-brakes. I have just ventured into discs and that is still a grey area for me, so I take my time and learn as I go along.
I don't know anymore, I am losing faith in mankind bit by bit!