Simplicity: are they exactly the same knob, thus lowering ordering costs, shipping and receiving costs, inventory costs, supply chain costs, design costs, and error potential? Quite likely. This also allows upstream suppliers to double down on volume and work to lower costs at their end.

Versus... the designer of a custom complex multi-part powered assembly (manufacturing cost not discussed, cleaning not discussed, visibility in varying light conditions not discussed) who has the fantasy that users want to squint at a tiny screen on a knob while driving, and that pushing all this and associated documentation down a global service network is going to come at an acceptable cost to users.

This begs the question: who's the real knob?