Perhaps it would be more accurate to say that user investment in a PC touch UI like the one in Windows 8 or 8.1 isn't necessarily making mainstream progress. I agree that touchscreens have some appeal on PCs; I'm typing this message on a Surface Pro 3, and I often use its touchscreen even in laptop mode to scroll up and down through websites-- so much so that if I switch over to a Mac or my Windows 7 PC, I find myself tapping at the screen before realizing it's futile. So I don't mean to indicate that touch is absolutely useless on PCs;rather, I mean to indicate that touch, as realized in Windows 8 and 8.1, hasn't swayed the majority of the PC market, most of which continues to invest in mouse-and-keyboard UI. I'm glad that Microsoft continues to invest in touchscreens, but it's clear a large portion of the Windows user base demands a first-class non-touch experience, in addition to however the touch side pans out. Personally, I think Windows 8.1 isn't bad, but it's clear that for many users, there's demand for a Start menu and a UI designed for mice and keyboards.