To me the project to come up with a new OOP system and integrate it into core Perl always seemed like a solution in search of a problem. And the problem that it aimed at had already been solved, over and over.

Personally and at $work I use Moo any time I need a class or a role, since I find it to be the perfect balance between functionality and simplicity. The new stuff lacks the majority of the functionality I use Moo for and doesn't appear to be significantly simpler to use, if at all. And having it be in core is irrelevant to me. I embrace a plethora of well-made modules from CPAN to get my programming done, and that's definitely not going to change. So I'm going to pass.