But I see what you are saying. The Microsoft provided Windows software maintenance environment is really far behind every Linux distribution. If you have a network of non-mobile machines that mount root via NFS, the work of the admin to install hard-to-install (because it's not available as a package) software doesn't necessarily even require creating package -- you install it on the root. I did this with some one-off stuff we needed that ended up in /usr/local. Voila, everyone has it. And while we all know this kind of software management (packageless) leads to a "messy" system, it's actually easier to pay off that technical debt because you can spend time later to provide a whole new, cleanly managed environment for your NFS root users WITHOUT causing them any downtime at all to do the upgrade. In a properly managed environment, the apparently problematic 3rd party software is just that: apparently problematic. You do the hard stuff ONCE, and that scales out to X number of machines (mobile or not). With Windows, you keep doing the hardstuff over and over and over because each machine diverges and there are so many things you need to touch during the install, and even things like installation are not nearly as automate-able as they are in Linux.
What would be really interesting (and I care about this not very much since I don't do even small Windows network deployments anymore, nor do I have plans to do so in the future) is some kind of installwatch style system for Windows, that re-packages installed software, installed with setup.exe, into, let's say, RPMs, including {pre,post}-install scripts that modify the registry (this is possible, I've used tools that do registry diffs). You'd have to have a clean master Windows machine to do this properly (easily solvable with virtualization), but it could be the difference between night and day when managing Windows installations compared with Microsoft's massive updates and each vendor's own installation method.
I've deployed both setups, and support issues went way down compared to Windows. The biggest recurring problem with the NFS root setup was hardware failures, but the "fix" there is to swap out the machine, which takes 5 minutes, and the user continues to work. Without having to store files on the local machine, by having NFS home directories, there's no need to copy files over to give someone new hardware either. With standalone machines, the backup strategy is even easier also, because you KNOW the user can only write to their home directory.
The hardest part of the NFS root was going through and changing all the configs to not require local write access (like for logging) or having it mount a ramdisk scratch area, and if you're experienced with Linux, this shouldn't be problem. I know there are projects out there that are supposed to make this easier and do a lot of work, so it may be even easier now.