Sure, touchscreens are cheap, but high-quality touchscreen software is most def NOT CHEAP!

Apple and Google have spent untold amounts of money developing iOS and Android. CarPlay and Android Auto are really nice.

Tesla has spent gobs of money on its touchscreen software too. It's the only native car touchscreen UI I've tried that feels smooth, snappy, responsive, simple.

I've tried the native touchscreen UI of quite a few US and European carmakers. All of them fall short. They feel janky, clunky, obtuse.

Physical buttons are much, MUCH cheaper than high-quality touchscreen software.

I think the reality is that it is harder to sell a subscription to a button than it is to software.