I disagree. I get into modern cars and there are so many single-use buttons and dials that I need a 30-page manual to figure out what they do. Only to find out it's something I would use at most once-per-decade. Touchscreens make this simpler IF they are done correctly. Therein lies the problem; most car makers can't design a good UI if they tried, because they are just so incredibly bad at designing software.
The only exception is Tesla. Everyone I know who has actually tried driving one immediately changes their opinion about the touchscreen, because in the Tesla is actually works and doesn't feel like it was designed in 1995.
Other car makers need to get their shit together on software; stop outsourcing, and try actually giving a damn about your product for a change.