Earlier quoted context omitted.
Interesting, I've never seen a microwave oven without a rotating turntable.
My parents have an ancient one, which they inherieted from a relative decades ago... It has a button to cycle through the power levels (the typical couple seconds on, couple seconds off duty cycle power levels), and four buttons to set the time: one under each digit (adds one to the digit and overflows to zero), the start button, something for temperature cooking if you have the probe (they don't). Actual buttons, be…
But I sure loved the fine grained time and power control. Figure out the setting put once and then it is unattended perfection every time.