Agreed, and different shaped well placed knobs My boss at work at one time had abiggish Fiat saloon which had 15 or more windscreen wiper settings which involved up to three different controls scattered more or less at random around the dashboard. As regards different shapes, I was surprised when I sat in the cockpit of a Vulcan bomber to see that there were knows of all shapes and sizes, why? because flying at night on a mission lighting was at a minimum and so the crew worked by position, touch and shape when selecting a control knob.
It's the same in a more modern aircraft.
The Weapons, Sights and Sensors controls in the Apache also has different shaped knobs for different functions. When you are in the dark, eyes out of the cockpit or on the displays and wearing gloves, this helps them identify the correct button.
The Co-Pilot/Gunner (CPG) has 74 different switches, some of these having multiple functions dependent on the action selected.
I used to joke with younger visitors of the PlayStation generation, that these knobs replaced the square, circle, triangle and cross buttons on the controller as the Weapons Control is exactly the same shape....