So trying to argue the 0th pillar "freedom of use" is about specific software capabilities is mistaken. It's a gateway to the un-reconcilable "well N users demand my software have feature X, and an equal number also demand an incompatible feature Y." How could one ever satisfy the 0th pillar under this condition, and why would RMS never discuss this situation?

Perhaps because it is the wrong interpretation. :) RMS spends time at the "licensing level", not at the "what does your software do exactly" level.

I find it incredibly surprising that many #FOSS or #FLOSS folk take the 0th pillar's "freedom of use" to mistakenly mean "freedom of usage by creating a software feature" instead of the true intended meaning: "freedom of usage under the license conditions".

Because that's what RMS has always been about: the software licenses being symmetrical in power between the distributor of software and receiver of software. It creates a level playing field in terms of what "politics" are contained in the software.

My ActivityPub philosophy: https://cjslep.com/c/blog/an-activitypub-philosophy