I just posted a response over on a CNET discussion topic. As often is the case, rather than write, review, edit and post; I banged away a response and submitted, as always I made a few typo’s, so here is a corrected version.
I’ve just retired from an senior engineering position at Dell, specializing in software and firmware but I also participated in a number of usability studies for hardware/software combinations. I was the originator of the NFC enabled server systems management concept. I’d offer a few thoughts to confirm what some others have said, but also a slightly different perspective.
1. yes reaching across a keyboard to a monitor mounted at the back of a desk is ergonomically unpleasant.
2. Touch is an interesting technology, but for fixed monitors and TV’s etc. it is less than optimal. There are numerous efforts underway to come up with a more responsive, natural way to control a UI. Think X/BOX or Nintendo, or the Samsung SmartTV gestures, voice ala Amazon echo etc.
3. That said, I for one would never go back to a non-touch laptop screen. I can lift my arm from the keyboard and prod the “submit post” button below much quicker that I can use the touchpad, or grab an extrnal mouse and click.
4. If you want a touch screen desktop I’d highly recommend getting an all-in-one with a touch screen and mounting it into a desk. I had one of the Dell XPS 27’s and had an IKEA draftmans desk. We cut a hole 99% the size of the screen; mounted the screen into the hole; secured it with picture wire in a # format across the back. I gave up using a physical keyboard and mouse, bought a Targus Stylus and went 100% touch. The advantage of the IKEA desk is that you can easily angle the surface to one that suits you. Also, it came with a medal lip which stopped things sliding off the edge; also it came with a built in glass area, which was great for to-do lists, notes etc.
One final note, on Touch screen PC’s. As with Windows 10, when switching over to touch screen you have to try to stop doing the way you did them with a mouse and keyboard. The Adobe PDF app for Windows 10, is much easier to use than the Adobe desktop app for Windows 10. Using a drawing program for line art, block diagrams etc. either with your finger, or with a stylus is a huge leap forward to messing about with Word and Powerpoint. In the case of slides, and powerpoint, it made me released me from decades of serial text mode slides.
So rather than ask why so few touch screens for desktop computers. Ask, what are top-5 applications I use, and how could touchscreen make them better, easier, or me more productive. If it’s email, calendar and web browsing, it probably won’t. Although even in those cases, zoom in and zoom out is an improvement.