Stallman doesn't even want that users know about that option. From Wikiquote: "The Adobe flash plug-in is non-free software, and people should not install it, or suggest installing it, or even tell people it exists."
This is different than "people should write their operating systems to proactively disallow installation of non-free software."
Note that the FSF even produces and distributes builds for Windows. Here's an example: http://www.gnu.org/s/mit-scheme . Most FSF projects that don't produce Windows builds directly provide information on where they can be found.
Stallman may not want people raising the profile of proprietary software, but he certainly doesn't advocate cathedral-style control of a users' computing platform.
Note that the FSF even produces and distributes builds for Windows. Here's an example: http://www.gnu.org/s/mit-scheme . Most FSF projects that don't produce Windows builds directly provide information on where they can be found.
Stallman may not want people raising the profile of proprietary software, but he certainly doesn't advocate cathedral-style control of a users' computing platform.