Back in the 80s, Don Norman popularized the term affordance. Humans need something to push, pull, turn or otherwise interact with. We are physical beings in a physical world.
Driving vehicles is potentially life-endangering. Just because the technology is there and cheaper does not mean that humans can push aside their physiological limitations in a critical situation.
Take the emergency blinker. You know where it is, you see it all the time - it's right there in front of you! But when a real emergency happens, you'll be fumbling for the button, concentrating on the situation at hand. Now imagine that button on a touchscreen.
I've noticed this with modern standards. They just don't have the same experience because nothing is actually linked. It's all electronic. I miss the feeling of the linkage as I moved through the gears. Feeling the disc touch as you let out the clutch. There was a magic to that. Now it has the feeling of setting on your hand for too long.
I use my four way hazard lights when there's heavy braking on the freeway to make sure people behind me are paying attention. It's a button on my dash and pretty easy to toggle.
Though is that something that touch screen cars really put into the touch screen!?
I don't think I've seen a car with the hazard lights button on the touch screen... Even the Teslas have a physical button for it. I imagine this must be a legal requirement, at least in some countries.