The context of this report was that Doug was presenting PTXprint, and was surprised when there were two unidentified numbers appearing at the top of the page. One of the numbers was the page number and one was the chapter number, but without the book name (because the \h was missing in the book). He said that it would be helpful if the marker check would report that as a problem, since we’re strongly recommended to run the chapter/verse number and marker checks before printing with PTXprint.
If this check was added to the marker check, it could be given as a warning, not an error, and it could just be limited to the 66 bible books, not the auxiliary books. Even if Publishing Assistant can use a \toc# marker for the headers, I would propose that having the \h marker would be advisable in case someone wanted to print a quick draft with PTXprint.
Maybe @dhigby wants to weigh in on the question, since it was his suggestion originally?