Comment by GordonS

Microsoft tried this on Windows 8, and it was a failure - as a desktop user, it was horrible to use. Even Windows Server 2012 got on this bandwagon, with a well-placed touch in the top right corner opening the full screen start menu - of course, totally unintuitive for desktop users.

Windows 10 still contains a lot of 'tablet friendly' features, but they've been dialled down and most don't get in the way of desktop users. I think they've struck a decent balance here between the needs of desktop, netbook and tablet users, but there is nothing here for smartphone users - converging those size-constrained needs with the rest is surely the trickiest thing to get right.

When looking at creating a convergent OS, I think it's really important we look at earlier attempts, so we don't repeat past mistakes.