see also: microwaves
A microwave needs two dials - one for power level, and one for time. Not a calculator keypad, not buttons with +1 and +10 on them or any of that nonsense - dials please. And start/stop buttons if you insist. That's it. It does not need a 'defrost chicken drumsticks' programme cluttering up the ui, because that function is far better fulfilled by a human repeatedly running the thing at low power for a few mins then poking the food with a finger