Since at least 1987, Cadillac is offering this with simple hardware push buttons. We have that in a VW "group" car and turning the dial in the center console allow to adjust as needed the temperature + airflow in less than 1 second.

This problem was solved over a decade ago with memorized seating positions tied to the key fob. It wouldn’t have been too much of a stretch (pun not intended!) to memorize and set the temperature alongside the other settings using the existing system.

Sure, but this doesn't matter much to me. You're objectively right that this fits someone's wants, but it doesn't fit my wants.

I have yet to come across a problem on an old Jeep Cherokee or Toyota Tacoma that I couldn't figure out how to fix with a little help from the internet, and I'm by no means a car expert. Sometimes the parts cost or size has shut me down, but not the complexity. An electric motor is far simpler than a gasoline engine, so it should be easier to work on, not harder. Can you fix your Tesla's A/C if it breaks? Can most mechanics fix your Tesla's A/C if it breaks?