|You aren't seeing those wheels on this bike. Really.|
I have tons of examples, and many of those things are also done by consumers. So, mechanics aren't the only ones, but we tend to be the most successful at things of this nature. Take for instance my use of 80's era Shimano aero brake levers and Avid MTB BB-7 disc brakes. Technically, this is a no-go. Impossible. You cannot make it work at all. But I rode my Karate Monkey with that exact set up for years and had great braking. Tricksy, it was. I've done the long cage Ultegra 11 speed derailleur with an 11-36T cassette for years too. That's another no-no. Cannot do that! But.......I do all the time.
I guess we mechanics just like to see what we can get away with. Now to be sure, some of these tricksy, false things don't work perfectly. A customer would never put up with the functionality of some things we do. But mechanics seem to know when to over shift a hair, or when you have to do something a "certain way" to make it "work". I'm not saying any of this is a good thing, mind you, but it happens. Experimentation. Tinkering. Basically being a mechanic means you have a proclivity for this sort of behavior.
So, today's example- Wrong wheels with tires not rated for the bike because "they do not fit and screw up the geometry", and a cassette from Shimano on a SRAM 1X chain and rear derailleur. It's not supposed to be. You aren't seeing this. It does not work at all. You cannot do this.
Except when it does for me........but I am a bike mechanic, after all.