in comp.unix.programmer i read:

>using a loopback device it gives someone the opportunity to experiment with
>ACL.

someone named root, most others cannot play.  this is not the impediment it
once was, but it can still be annoying.

>The old RWX way is cumbersome [ chmod 2775 file ].

i see you didn't show how easy acl's are to use.  they are feature-rich, so
the language to manipulate them is far from the simplicity of chmod.  oh,
and they aren't standardized between systems, so what you learn on linux
has little chance of applying on anything else -- hell, even between ext3,
reisersfs and the other linux filesystem types there's plenty of variance.

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