The people in car companies (engineering and management) are typically "gear heads". Not only do they care about the mechanical systems, they care enough that they'll make sure certain customer-invisible things (internal to engine, for example) or customer-subconscious things (in Mercedes' case how the hinge on the door works) are "just right". Kind of the equivalent of "I'll spin up another server when the load gets to X% just to have a good safety margin" or "this onboarding path could look like a dark pattern -- let's work around that just in case".
The embedded software developers for engine control are serious. Among the mechanical engineers the folks writing control software for steering stability or performance-vs-efficiency code were treated with respect ("I don't understand what you do but sure, happy to explain this mechanical system"). But the people doing the UI were basically considered marketing.
Seat must be comfortable. Visibility good (cough Prius).
Oh the audio system? Automatic seat adjustment? Bluetooth? Let's write a requirement document, or even just a requirement powerpoint and send it out for quote. It's not that important and cheapest bidder is fine.