Look no twiddly nobs!
That's all well and good, but say you want to turn your heated seat off whilst doing 80 on the motorway. In most cars you have muscle memory of where the control should be, so you poke around and find it and press the button. In that you have to take your eyes off the road and look for it, make sure you press it and not anything surrounding it that could change something else, then glance back at it to make sure you were successful.
Personally I like screens in cars (but can see why some don't), however touch screens are a very bad idea.