For the vast majority of the global population ( well in excess of 99% ), the ability to access source code is of zero value, because they can do nothing with it, and would not want to anyway. It may not even occur to RMS that the vast majority of software users don't care about source "freedom", simply because it is so important to his worldview and sense of self.
I think that
is should be about to change. If the likes of Elon Musk (or rather his employees) succeed in creating more and more smart implants it will be of vital interest to take a look at the microcode. I won't forget his introduction of neuralink as "it will blow your mind". What a great description for a brain implant...
Some militaries purchase missiles and jets without access to the firmware. How convenient, no need to disguise backdoors as bugs.
I thought about using OpenBSD as desktop environment for a while but it was not exactly a smooth experience. When it comes to Linux i have grown lazy (Ubuntu).
Linux makes things so easy nowadays. It still lacks the charm of a good old long AIX boot sequence. Glory days.