This is exactly right. Happened to me last weekend driving to the mountains in a snowstorm. White-knuckle driving conditions, and yes, all of a sudden the window started fogging up. First, I hesitated to even turn on the defogger because I knew it was going to take my eyes off the road for longer than I wanted. But the windshield kept getting foggier. In the V10 days I could easily glance at the (relatively) big defogger button and tap it quite quickly. Almost no time looking away from the road. Now I have to tap the temp control... as others have said, depending on exactly where I touch it, I might get the mini-controls, or I might get the full controls. Now look back at the road to make sure I don't drive off it. Meanwhile windshield is still getting foggier. Now look back and tap the defogger, which still requires more precision than it used to, because the button is now kinda in the middle of the screen instead of nested at the bottom.
Not to mention if you get the mini-controls, if you don't click the defogger quickly enough, the controls go away and you have to start over.
Voice controls would not have worked, I was in the middle of nowhere, no cell coverage. And I wouldn't be sure what to say, anyway.
It was a bit nerve-wracking. I did not crash, but that does not mean it's safe. The old way was absolutely safer.