I agree 100%. That's why I changed over 10 years ago from Windows to GNU/Linux. That's why my music is stored as OGG Vorbis instead of MP3 or other MPEG formats, my chat accounts are XMPP rather than WhatsApp and stuff, my mail accounts use IMAP instead of MS Exchange and my office documents are OpenDocument instead of MS something.

This works perfectly as long as my social life is restricted to the bubble between the chair and the keyboard.

I do know people outside this bubble, though. The send me music files (MP3, AAC), Powerpoint presentations and want to contact me on the messaging network they use. I have to make choices between my nerdy moral standards and the real world. I chose I want to be at least able to listen to MP3, but never will encode audio to this format. I chose I want to be able to read files from MS Office applications, but will not save to this format. I chose I will not encourage the use of proprietary and closed chat services by taking part at all, nor will I use ActiveSync servers. It's my decision.

(On mobile devices including the Jolla phone, the situation is even more dramatic because of the industry standards around 3G and friends.)

What I do not understand when you, nthn, and others oppose the use of exFAT so radically:
Where's your crusade against MP3 support on the Jolla phone?
Where's your crusade against ActiveSync support on the Jolla phone?
Where's your crusade against patented and closed phone technology on the Jolla phone?
Where's your crusade against commercial video codecs on the Jolla phone?
Where's your crusade against facebook support support on the Jolla phone?
...?

With exFAT support, you could at least easily choose not to use it. The video recordings on your Jolla phone though are always saved as MP4, not as an open alternative. No choice here. I really wonder why I never heard such drama about these issues but everyone suddenly identifies exFAT as the only threat to freedom in the Sailfish ecosystem. That's hypocrisy.