The ancient microwave in my first apartment. It had two knobs: one for time, one for power. It's immediately obvious how to cook something for how long, how to add more time, etc. All other microwaves that I've used I had to have someone explain to me what buttons to press in what order to do even the simplest things. And I've never seen anyone use all of those fancy buttons.
https://www.amazon.de/Severin-MW-7874-Mikrowelle-kombinierba...
I explicitely chose that mircrowave because it only had two knobs and I just get confused with too many buttons. I always thought I am weired for not wanting all these special features.