Just simply because interfaces need to be crafted, and they're a design language that you learn over time. And most likely everyone needs the same things 90% of the time anyways.

When I step into my car I don't need the heating button to move closer if it's cold. I just want to learn where it is once and use it when I need to for x number of months / time of day.

That also goes for things like films and music - most of the time we actually want to be seeing and hearing the same things as everyone else (for some different definitions of "everyone"), not something that's made for us.