@awb the SysV shuffling annoyed me as well when packaging FOSS for Solaris and we'd have to shuffle their man pages to fit, and when I had to implement support for it during the conversion of X11R7 from Imake to automake. So when I became tech lead for Solaris 12 (later renamed 11.4) I decided we'd undo it:
https://blogs.oracle.com/solaris/post/normalizing-man-page-section-numbers-in-solaris-114
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