In my opinion, the reality is that cars are moving past the Mustang era and are becoming computers on wheels, consumer electronics with evolving UIs. But we aren't used to that idea, yet. So when our car UI changes significantly, we resist it because we grew up with cars with a fixed UI. Those days are gone.
With every smartphone, table, and computer UI change, some people like them and some people hate them, and some just quietly adapt. It is impossible to satisfy everyone, but that shouldn't stop manufacturers from changing and evolving their UI design.
Sometimes UI changes are made and then quickly revised because of a high level of customer satisfaction. It already appears, based on the latest European Model S software, that Tesla has responded to customer concerns. Elon has made clear that the coming V7.1 release will introduce additional UI changes.
Interesting times...