The guidelines for abbreviations buries the lede. Instead of saying “no other abbreviations are allowed” at the top it puts that information most of the way down the page.
That statement should be at the top, in a separate paragraph. In italics or bold according to a recent message I received.
When I replace an abbreviation and include a link to the current guidelines in the edit justification I often get push-back. Recently, from a contributor and referee with almost a decade of experience who has added thousands of pages: “I don't see mm as not allowed...”
The most important point of that page should be very easy to find.
