Zealotry vs. Pragmatism
I respect the FSF, quite a bit. Mostly for their history. RMS strikes me as a fanatic, and a disagreeable person in general, but that's his game. Linus Torvalds can be very disagreeable himself, threatening to kill people at ARM and SoC design labs for instance. Alot of engineers and academics are asshats sometimes. Same with Politicians, and RMS acts more like an unconventional Politician than an engineer anymore. Nothing wrong with that I guess, but people tend to follow blindly and I see that as a problem.
But I'm far from what you'd call a Free Software or even Open Source zealot. I understand Software licensing, something that both sides of the debate would do well to actually learn before licensing under the GPL, BSD, CC, or Apache License, and its legal quirks, that being said, IANAL and while I get they're just trying to reiterate a point they've made countless times in the past, it seems to me that the FSF is once again the lonely voice crying out in the desert and only a very small number who may consider purchasing iToys are really going to take into account the FSF, GNU, and Stallman's feelings on the subject. Quite a few of their users have no idea what the FSF is or who Richard M. Stallman is.
My good friend uses an iPad, a MacBook, and an iPhone on a daily basis, he asks me about FOSS all the damned time because he knows nothing about it, and is kind of on a crash course with debian since he started managing a college radio station, which sucks for him. I use Fedora, CentOS, and RHEL. I can handle Debian, but I don't know all that it does, and Ive never had time to learn it beyond its basics as Ubuntu pissed me off back in 2006 and I haven't been a fan of Debian derivatives since, not out of disrespect, just out of necessity, as I seem to do my jobs faster on CentOS or RHEL, I know how to use RPM much better than APT, and with Fedora on my desktop and test VMs, I know what's coming down the pipe soon enough). People like my friend here may have seen the GPL a few times on installing programs, but thats about it.
Hell, even Mac users sometimes have no idea that their Kernel is basically CMU's Mach (which at one time was a candidate for GNU's "failed" kernel project AFAIK), and their userland is basically BSD's.
For the rest of us, especially those that work with FOSS, Its important to note whatever the FSF is complaining about, and paying heed to it, but letting the FSF or anyone else dictate your on the job behavior is zealotry (or simple arrogance, youthfulness, or amateurism masked as zealotry).
The only way in the real world to get ahead, especially in anything related to any of the sub-disciplines of IT, is learn as much as you can about your profession, whether its so open its Public Domain, or so Closed that IBM, et. al. make you sign a Non-Disclosure Agreement to work on it. Being pragmatic about what you know and learn will keep you from falling into the trap of specialization and obsolescence. In real life you have to use the correct tool for the job, and sometimes the client may go so far as to specify what tool they're forcing you to use, whether its FOSS or something Ultra-Mega-Sue-Your-Pants-Off Proprietary with 500-Patent-Encumberances at no extra cost*, you might be stuck with it, so learn how to use it.
TL;DR - Moderating your position can do you a world of good professionally.