> a microwave only really needs one (and ideally its just a dial instead of a button).

The 1967 Amana Radarange (https://media.npr.org/assets/img/2017/08/28/microwave_custom...) had two dials: short duration under 5 minutes and a long duration out to something like 30 minutes.

My parents still have theirs. It needs some resto love, but it’s still fully functional. I’ve already put my foot down in terms of who’s inheriting it.