It's "non-trivial" to switch to driving a 18-wheeler truck, or stick-shift transmission, or that funky wheel thing in Teslas, which don't support the same software that other car infotainment systems do.

You can't force everything to be uniform and support all of the same features to make switching between manufacturers of a product-class "trivial". How's that part of a healthy free market? Requirements to that effect kills all creativity and specialization of products for different purposes. Android and iOS are different and that's a good thing!