"principled"? I really try to avoid closed source proprietary software as much as possible both for ideological reasons but also because it's a pain in the ass if you like to hack your OS, you need to step around it all the time.

I can understand thinking it's a "fundamentalist" mindset if you're used to Windows or Mac and software being proprietary by default but if you're a un*x poweruser who doesn't hesitate to hack the source code of the software to customize it it's a very pragmatical approach I think.