[Radio Wrangler]

Ignoring disabilities, look at the ergonomics... A telly with two knobs. One does volume, one changes the station, AND the stations stay in the same places. You don't really need a lot more than that.

to drive my microwave cooker:
Press 'Time'
Press up down buttons while staring at the display to set the wanted cooking time.
Press power level button
Back to the up-down buttons while staring at the display again to set the power.
Finally, press 'Start'

How about the ones with a mechanical timer knob ? Add a knob for the power level and you have a much more sophisticated machine. Ergonomic, fast to set, and anyone can use it.

There's the old user interface joke.... You have a futuristic car which runs (operating system name redacted). A child walks out in front of you. Click on 'accelerate', then on the drop-down menu, click on decelerate. A wizard appears. Click on up-down buttons to select the strength of deceleration required.click on 'apply'

Good user controls which work directly, which operate in an obvious way aren't just for people with difficulties.

We all need them.

David