Unless you want to program a start time, you don't need any buttons on a microwave. Give the uses of a Microwave oven, time programming is going to be rare.
Actually Microwave oven uses a magnetron and they only go at one power. The power setting simply cycles it on and off, thus 100W instead of 800W is on & off cycle of 1/8th & 7/8ths.
I saw one the other day with even a mechanical timer (like wind up kitchen timer) for cooking time.
Many have overly complicated panels of poor design. You can still buy ones with simply two knobs, power and time. Simple. Ours is electronic so the time counts down on the display. The display doubles as a clock when idle, though you can't program a start time.
<rant>
So many things such as car radio, alarm clock, cooker, recorders, etc lose all settings on a power cut. It's reasonable for safety that if there is a power cut that cooking is cancelled, but sheer greed or stupidity to not have a 5 to 10 year life easily changed backup battery for a clock and 32.768 kHz crystal instead of counting mains frequency (both together adds less than $2), and a 50c Flash/EEPROM for the car radio settings. We have had both of those for over 30 years.
</rant>
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