I work with a lot of people who have desktops. I have two. I haven't seen anyone use a traditional desktop with touch. No one. Not once. My girlfriend is a 2d artist and she uses a wacom tablet for digital painting in photoshop. That's it.

I always disliked the huge buttons that come by default with some desktop environments, and I'm amazed the argument is "people use touch". As far as I and everyone around me is concerned, no they don't.

If it's an accessibility issue, it should be an optional solution for those who need it, not the default.