You don't have to take your eyes off the road to operate a control. You might need to learn where some are in a new car, but then you instinctively reach for and operate the ones you use all the time. It's muscle memory.
This is not the case in a touch screen where controls may or may not be visible at any given time and you have no chance of operating them unless you physically look at the screen to control where you touch it. Maybe this arrangement is fine for some non-critical functions, but it absolutely isn't for critical ones.
What is worse is that cars from Tesla are even getting rid of indicator stalks which is fantasically dangerous. Maybe it's not a big deal in the US where roundabouts are uncommon but they are all over the place in Europe and the rest of the world and lack of indicators will cause crashes and fatalities. Just so Elon Musk could save a few bucks on a stalk. And if that results in a lower EuroNCAP score then boohoo for him. I can imagine the raging and legal threats that he'll engage in if that happens.