We have a bunch of posts here on Meta of official FAQ content collected under the faq tag. This tag has special official status, as indicated by its pink color and by the fact that its use is restricted to moderators.
As these posts describe official site policy, it seems that they are the wrong place for discussion of such policy, and that they should only be changed when there is community consensus to do so, as indicated by Q&A on Meta. They were created for the purpose of providing clear, actionable statements of site policy, so that users don't have to parse pages of commentary to figure out what to do. Allowing discussion on them makes it likely that they will just turn into new repositories of potentially-confusing discussion, rather than clear statements of actionable policy. It seems, therefore that discussion about changing them should be via Q&A on Meta and not via comments or edits on them themselves by the community.
Therefore, I propose that the moderators lock these posts and include a note saying that further discussion is encouraged on Meta, and that if there is community consensus for a change, the moderators will implement it.
There is precedent for this idea in the coda to this FAQ post, which states:
Any requests to change standing site policy should be directed to Mi Yodeya Meta. First, though, please see the primary thread which led to formulation of the above material and other questions with the scope tag.