Isn't it pretty much the only example of this? As long as you don't pick nvidia, you won't have proprietary drivers running.
Of course there are many firmware blobs. It's an issue, I would prefer not running any proprietary firmware, but I don't see how it would be a bigger issue in BSD land.
So yes, the issue is programs assuming Linux (though doesn't many people in the OSS ecosystem using Mac help a bit?), hardware support, and not as much help from the internet. Not too surprising, I would expect this; and the hardware support is what prevents me from considering *BSD. I didn't think of the fact you are not going to be on the bleeding edge too on *BSD, and that would be relevant to me, since I run a rolling distro and take this somewhat for granted.
Bonus note:
> You try to Kagi[6] it and nothing
I would suggest "look it up" as a term that will remain stable and doesn't advertise a particular search engine. The best thing is you won't need a footnote either (however, I sympathize with the wish to make people use something else than Google).