Well, first of all as far as the network integration, of course a full fledged OS has an advantage over a mobile OS.
Not quite sure what that has to do with anything. It's just a matter of network protocols being applied right? Is there anything stopping them from implementing the full suite on the mobile? Is there anything keeping them from implementing Network Printing? Having network browsing integrated into the file system? (neither Android nor iOS lets you do that). There are apps that do it, so it's not like it's a limitation of the OS.
Anyway, my thoughts.
I managed to free up a spare laptop harddrive and tried it today on the Atom. The taskbar is still there and it seems to still work the same way. The only major change if seen so far that would affect me is that of the Start menu being replaced by Metro. The application icons on the taskbar still stack.
Activating the Start menu is still the same for me. I don't actually click on the start button. I've always dragged the mouse all the way to the left corner and clicked. To minimize everything, drag to the lower right and click. On the new interface, the left side of the taskbar is the new 'start' button, and the right side is the usual minimize button.
Since Windows7 when i started pinning everything to the taskbar, the start menu has become a mess. I used to keep everything in folders inside the start menu so i can have easy access from Win95 to XP, but Win7's ability to pin meant i just use the application once, and the pin their taskbar icon to make them stick there permanently.
The middle button functionality on the taskbar got passed on to metro. Using notepad as an example, if you were to pin its icon to the Win7 taskbar, middle clicking it would launch a new instance of it. So if you middle click notepad three times, you end up with three notepads on your desktop. If you hover over the notepad icon, thumbnails of the three apps would appear above the icon, and if you middle click those, that instance gets closed. I first learned this on the webbrowsers (It's always been "middleclick link = launch new instance" and "middleclick icon/tab = close instance") before i started doing it to the desktop applications too.
The desktop is still intact, so the new interface does not affect your productivity wise. Programs are still running in windows. You can still have a little video players on top of the spreadsheet you're working on.
The main thing that would affect me is that i'll likely move most of the pinned shortcuts on my Win7 taskbar to Metro.
To Launch on the Different OSes, this is how i used to go through to launch Firefox as an example:
WinXP:
Click Start -> Click 'Communications' folder -> Click 'Firefox'
Win7:
Click Start -> Click 'Programs' -> Click 'Communications' folder -> Click 'Firefox'
Win8:
Click Start -> Click 'Firefox'
If you look at Metro as an enhancement of the Start Menu launcher, rather than the entire Win8 (It still primarily uses Explorer.exe). It does have potential. I'm a web developer and i do a lot of multitasking. So i'm always looking at devices on how useful, detrimental, or adjustments they are to my work. From what i'm seeing so far, i think i'll have no problem working on this. The Win7 taskbar is the one thing that i really appreciate over WinXP. Metro seems like a good way to act as a drawer for my commonly used programs. I have to minimize everything to access the desktop icons, and the task bar isn't big enough to house everything, so this is a good alternative.
BTW, i have not yet watched any Win8 video, article, or reviews, i just downloaded it and exploring with no prior knowledge on where everything is. I've only googled twice. The first was the error i kept getting while installing (Recommendation is to install Win7 first since it has working drivers, and have the Win8 installer run off that), the second was when i was looking for the shutdown button. The rest was just applying how i used the Win7 Taskbar (Corners, middleclick, tabs, etc.). Configuring it was identical to Win7 since the Control Panel and Desktop were still intact.
After using it for a bit. I really don't get the hostility towards metro. Right now on Win7, i have to click the Start button and browse through the dozens of folders and links to get at the program i need. Metro basically has all the commonly used applications in big icons right in the middle of my screen when i press the start button. The unnecessary ones i simply unpin (Metro links are also 'pinned' like in the taskbar, they are not individual links) and the metro can tone down on the clutter.