This doesn't make any sense. Many regular issues are not diagnosable by computer. I have legacy access to some current BMW service data and it does not behave the way you describe at all- I only have to whip out the scanner for certain electrical and computer issues, and to update service schedules.

Everything on a modern car runs through the computer. Climate control, entertainment systems, windows, lights, seats, various driver aids such as cruise control, lane-departure, blind spot warnings, hands-free driving, automatic/antilock braking, traction control, etc. as well as the engine and transmisison. Sure, something like a failing wheel bearing would still be diagnosed by the mechanic, but they need the scanners for most of the problems on a modern car.

Oh, I thought you were talking about motorcycles. My BMW motorcycle has only 2 of the 11 features you mentioned :)

You're right, but just to have fun with the example you gave- some wheel bearings now incorporate a wheel speed sensor. So even those might, in fact, be first diagnosed by the computer, depending on the failure mode.

The computer diagnostics don’t tell the technician how to do the replacement. The service manual has all of the procedures, parts lists, and special tools necessary for the job.