I don't know enough history here. The current Moose docs say "Moose is built on top of Class::MOP" so maybe there was a different MOP effort that succeeded? That MOP is probably closer to 6Model than Moose itself.
Moose and Class::MOP predate 6Model. As far as I remember and can verify, Moose 1.0 was out (spring 2010) before 6Model even existed or had a name (late 2010).
Moose did take inspiration from the object model designed for Perl 6, but it grew out of attempts to implement that object model in Pugs, not Rakudo. You might even say that it was the first full implementation of the Perl 6 object model.
Thanks for the history. Sounds right. So 6Model and Moose are siblings, rather than parent / child.
I think my original point, though, holds up: One of the actual delivered achievements of the Perl 6 project is a sophisticated flexible object model, now in production outside of Perl 6, and also the basis of deeper (re)design within Perl 6.
