Sorry to be a contrarian, but I don't think future mechanics will have an easy time of it. I think it might be death by a thousand cuts. My '92 had two computers on it (ECU, and ABS), plus a stereo, and everything else was a switch, a few wires, connectors and bulbs (not counting body parts or engine parts). The dash was mechanical, tach & speedo. A car today can have over thirty computers, not to mention all of the custom gizmos for windows, air flow...
Even basic vehicles have at least 30 microprocessors, controlling functions like braking, cruise control and entertainment systems.
www.nytimes.com
A modern car has on the order of three miles of wiring in it;
Combustion Cars: Supplies of the auto part were choked by the war in Ukraine, which is home to a significant chunk of the world's production, with wire harnesses made there fitted in hundreds of thousands of new vehicles every year.
auto.economictimes.indiatimes.com
This high end Bentley has a 110lbs of wiring in it compared to a 50 year old muscle car with ten pounds;
It Takes a Lot of Wiring to Keep a Modern Vehicle Moving (Witness this Bentley’s Harness)
I have a car that if the infotainment unit freezes or dies, the vehicle will not function (supposedly to prevent radio thefts, but I am not buying that. I think it is to prevent aftermarket upgrades.)
I'm no fan or carbureted engines, but you can hand crank a Model T and it will run...
All the best,
Peter