When I heard RMS speak a few years ago, he made the distinction between devices like microwaves, and general purpose computing devices. The latter you want to be running Free Software. But for the former it's not really an issue.
Unfortunately, the line between the two is blurry at best. For example, I'm not sure how well this jives with the case of the printer software which provided the catalyst for RMS starting the FS movement in the first place.