[mst]

Moose is pretty much a straight up implementation of The Art Of The Meta-Object Protocol, which is a seminal work on the subject (plus a few extra bits like Roles inspired by smalltalk traits and CLOS-style method modifiers).

Over-use of meta stuff is something people often get tempted into when they first use Moose and can make things a bit more complicated, but the core syntax is honestly simpler and easier to use than raw perl OO and I've found it much easier to cross-train non-perl devs to Moo(se) style OO.

If you want an opinionated/terse syntax that encourages you to only be as clever as strictly necessary, I'd suggest looking at http://p3rl.org/Mu