I love my new microwave oven.
You just can’t make any simpler.
2 rotating knobs. That’s all ! One for power setting, the other for timing.
Nothing else, not even a start button.
And that’s the beauty. Once you set the timer, it goes off by itself, 1 second later.

The same goes for every thing designed.
Be it a graphic design, a web design, an industrial design…
You made a simple product, almost an archetype.
Find that extra button you can get rid of.