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It's kind of surprising to me that in 2013 Linux is still having issues with more than two monitors running from a single card (which the NVS450 is capable of four total).
I'll tell you the main reason my company doesn't use Linux and restricts its usage - because it's FOSS. The integrity of the code is, at best, shaky. I'd also say that having an anonymous FTP, SSH, and HTTP server running on a box right from the get-go is a giant security hole and should be plugged up quickly if it won't be used. Also, have you heard of Windows PowerShell? It's pretty much the bee's knees for a shell (and is secured by default) and comes standard with Win7.
In a properly secured corporate Windows environment (basic AV/malware scanner and non-paper thin firewalls), malware is a non-issue and easily caught to be fixed. There's multiple good solutions for pushing non-MS software updates, Lumension being a step above the rest.
In a home environment, Linux is good enough for most anything except bleeding edge gaming. Gaming is a huge market for computers. Something that Linux cannot compete in without Wine which only works sometimes with some games and not easily configurable for the average end user. Most of Linux is really just not very friendly to your average end user even with a lot of the improvements I've seen the Linux desktop go through over the last decade. It's friendly to techies and computer savvy people but to average people, there's a steep(er) learning curve compared to Windows. Who here that installed Linux for their grand/parents didn't have to sit and show them some of the basics for getting around that would've been fairly intuitive on Windows?
Why are you even talking about ROM Manager when you haven't used it in what seems like a couple years? Your experiences from then are completely baseless for it now.
What's wrong about usage statistics and seeing what an app's install base is for an indie developer? Once again, you can disable that in the options.
When was the last time you actually used ROM manager?
The only tablet out that has the ability to root with the least hassle is the Motorola Xoom which you would just do a "fastboot oem unlock" from the command line (requires Android SDK installed). That doesn't fit your 7" criteria as it's a 10" tablet.