As best I can tell, the touchscreen is added at the concept phase by folks who mostly know what's going to make people look at the car and want to buy it, several years before the car hits the market and well before the actual car electronics teams are involved.

So, yeah, car UI/UX sucks right now because we're seeing all of the things added to cars a few years ago in response to Tesla and implemented by people who think that just because they programmed a random car-focused microcontroller back in the day that this means that they understand all of the layers involved in a modern Linux or Android or Windows embedded car electronics unit including layer 8 of the OSI stack (meaning: interfacing with humans)

But, yah, dono. I don't actually have my own car. My spouse got a Mazda a bunch of years ago now and it has actually a pretty good touchscreen interface with physical controls such that if you want to dig into stuff, you can touchscreen but all of the common stuff is switches and knobs. The generation before that had way way too many buttons and it was just gag-me-with-a-spoon. The generation after that removed the touchscreen because the leadership at Mazda decided people were just not to be trusted with a touchscreen and I feel like they went a little too far in the wrong direction. Meanwhile, in airplane cockpit design, they put great pains into having you be able to navigate by touch where necessary such that all of the knobs are differently textured or shaped. And, as I said, I don't actually have my own car, but I have to say that if I did have a car, I'd want it to be designed like that.