When you’re fumbling to find the right switch/knob by feel your focus is still not on driving. It is at best very marginally better, and probably worse because you now think you’re still paying attention to driving even though you really aren’t. It’s still illegal to text while driving, even on an old phone with a physical keyboard, specifically for this reason.
Volume control is also accessible from the steering wheel on pretty much any car produced within the last 15 years, and certainly any with a touch screen. I’m not comparing to steering wheel controls.
I’m comparing it to fiddling with AC settings on a centre console like everyone seems to me mentioning in this post.