The proposed POSIX.1e standard defines a few things like ACLs that are widely supported. But the proposal itself was withdrawn. How come? The only reasoning I've found online is this quote from http://wt.tuxomania.net/topics/1999_06_Posix_1e/:
Why Posix.1e was abandoned is difficult to understand from today's (July 2014) point of view. Solaris, Irix, Linux, and probably other Unices seemed to recognize the standard. On the other hand the FreeBSD project found counter arguments and didn't integrate capabilities ('fine grained privileges') by default.
On the other hand, Jörg Schilling said this on this site (What is the exact purpose of `mask` in file system ACL?)
BTW: The POSIX-1003.1 draft for ACLs has been withdrawn in 1997 by the reference implementations (a.g. Solaris) because it turned out that customers wanted a more powerful method that has later been standardized as NVSv4 ACLs.
Is there a more detailed account of what happened?