Next thing you know these dirtbags are going to want to choose what wheels and tires to put on these things. The nerve!

(Yes, repairability and standardization are encouraged where feasible.)

I would guess there are a couple of orders of magnitude difference between the complexity of interfaces comparing the head unit with wheels and tires.

Like, the head unit is in control of all that happens on the slow bus of the car, and needs to pass independent safety certifications for a complex system.