Why would a high-end car need regular updates? The only thing it needs to do that isn't guatanteed to not change without physical service is entertainment, and it's a safe bet anyone who can afford one has a smartphone they keep updated. Just make the pocket supercomputer do all the work and use the car as an input/output interface. This problem was solved decades ago on the internet, funnily enough by the same guy who founded this forum. Why is the industry at large so bad at retaining good practice knowledge?