The problem with feature updates that change the behaviour of the car is that they can be dangerous. Drivers come to rely on expected behaviour, and there are examples of accidents in Teslas where the driver seemed to rely on past behaviour to be repeated. I know, it's never a good idea, but that's how human beings are and you have to engineer stuff with that in mind.
Other manufacturers do alter behaviour as well, but typically only rarely and by requiring a dealer visit the owner is made fully aware. The worst is when they nerf cars. There were some Mazda hybrids that had performance nerfed when they found that the batteries were dying prematurely, and of course the dieselgate scandal resulted in a lot of cars having reduced performance and massively increased maintenance requirements.