I hate bad usability in cars
I used to drive a Nissan Almera which had a central dash with buttons numbered 1 to 6. Two buttons either side set the mode for what they did. If you were in radio mode they changed the radio station. If you were in air conditioning mode they controlled the fan speed. This meant at any given time there was a 50% chance they were in the wrong mode and it screwed up the action. Such a stupid system may have saved Nissan £1 for a couple of extra buttons and caused untold confusion and frustration for me.
IMO every basic function in the cabin space should be controlled with a button, dial or switch which are grouped sensibly with the most important functions closest to the driver's line of sight. If there is a computer / tablet interface, save it for the extraneous stuff. And make damned sure that it is predictable and navigable with only the briefest of glances.