Climate is not ternary, it's definitely important for driving in cold climates. To the point that if you can't see ahead, you need to stop on the expressway in order to adjust the airflow to windscreen, so that you don't collide into the other guy who has stopped to adjust the airflow in his car.

Climate can be controlled by steering wheel too.

Of course. The point is that you need to have those dedicated controls with ergonomics that support driving, not touch screen.

Think I have seen flight attendants use a touch screen on the intercom and the cabin lights / infotainment. I’d assume everything on the cockpit is life of death for ~300 people, so different rules apply. Imagine what a sick joke it would be if the recent Boeing crashes were caused by pilots fiddling with a touchscreen while the plane went into a dive. It’s difficult enough to work all the controls accessible without tabbing or scrolling.

> So yes, you can have cabin light and temperature controls on touchscreen on an airplane.

Which means, annoyingly, that you can be locked out of those controls during crew announcements.