A zillion buttons aren’t really necessary in cars. Niche functions you use once in a blue moon can stay on screens. But the basic functions of a car, like turning signals, lights, or gear shifting, require tactile, obvious, well-known interfaces. I was taught to drive on a Toyota, and my dad’s car at that time was a Ford. I did not need to re-learn how to control the basic functions of the car; even though there were some differences as to where some things are located, the controls are immediately obvious. If I get a rental Kia or Volkswagen or Nissan, I’ll be able to immediately drive it even if I’ve never driven one. But if I get a rental stalkless stickless Tesla, I’d be completely lost and need extra training.