WinRT needs to die IMO, all aspects of it. Games and mobile apps can be programmed for windows, although it's true they may want to have some commonality for windows phone and windows tablets with full windows.
Having an API that can work just as well for building a mobile app as it does a full on high end desktop program would be a pretty nice thing to have. WinRT has the potential to be just that. It's only capable of cheesy mobile apps right now, but if MS expands upon it, it could be the perfect catch all solution, and a great replacement for Win32.
As for the UI I have no trouble whatsoever using my finger on the desktop on a 10.6" screen, but I do think the desktop needs to be a bit more finger friendly, but I don't think iOS or Android are necessarily "that" much better in terms of finger navigation, and if they are then the app/program suffers in functionality because of it.
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I kind of agree, that a unified OS might just be unfeasible, I'm not quite sure how I feel about it either way. I know that on my windows tablet I very rarely touch Metro, using the windows desktop 99.999% of the time and am quite happy that way. My only gripes are the onscreen keyboard functionality and the overall DPI, especially with higher resolution screens like on the Pro. But yes I think not just resizing, but rethinking taskbar menus and such would go a VERY long way in making win8 useable on a touchscreen instead of junk like Metro.
I just don't think that a windows based UI works with fingers. All that dragging, docking, and resizing works great with a mouse, but doing all that on a small screened tablet is way too cumbersome.
You, I, and most everyone else on here are old hand computer geeks. We'll be willing to put up with the quirks and hiccups for the sake of added functionality. But it's still not ideal. A good UI needs to be both functional and easy to use. A desktop UI on a tablet is more the former, less the latter.
In my opinion, metro snapping is a great first step towards multitasking on a tablet. Being able to quarter dock (or half dock) two apps side by side is a handy feature to have. The only downside to it is you have to use a 16:9 screen to give all your apps the most room.
Take makes it easier to multitask between two apps, but what about people who use more? You could fix that with a virtual desktop type setup. Something sorta like mission control. You could have Metro Office and IE docked on one screen, and a file explorer opened on another.
And you launch apps or switch desktops by using the good old fashioned Windows taskbar. You know, I've always been of the option that if MS kept the taskbar visible at all times, no one would have any problems going to a separate screen to launch apps. It and the Start screen could be the bridging points between a desktop UI a touched based one. The only difference between the two would be how it treats apps. Desktops launch windows when you click on an icon (or tile), tablets launch them fullscreen and dockable. Both of them manage open apps or launch new ones using the taskbar, and both go to the Start screen when you click the Windows button.
This way, you'd have the same OS running the same programs, but the UI is tailored slightly different depending on what it's running on. With a bit of polish and shine, it could work fairly well. You'd have something that functions a little differently, but still has enough of the same anchor points so it doesn't feel like you're moving to an entirely different OS.
Or in short, it's unified where it needs to be unified, different where it needs to be different.
edit: If you want to know what I'm getting at, just look at Gnome 3.8 on Linux. It's just shy of being a perfect touch/mouse unified OS.
BUT.... the caveat here is that 7-8" windows tablets are on the horizon, now the desktop on those will be completely horrible for touch navigation. It's another disaster waiting to happen because of MS constant shortsightedness.
Yeah, I'm not getting the 8" tablet thing at all. I just don't see it working unless people stick to Metro 100% of the time. The only good point about it is MS is making Win 8.1 run even thinner so it'll still be smooth on lower end hardware. That's a bonus at least, but...ehhh...