The issue is that someone has to decide what "participating in society" actually means. Today, it's often seeking work or working for pay - but we already agree

The issue is that someone has to decide what "participating in society" actually means. Today, it's often seeking work or working for pay - but we already agree that there's ways of participating in and contributing to society that don't involve that. I'm sure that whatever you or anyone else can come up with that's "easily measured", there's people who contribute to society in other ways, and people who can't participate in the way that you want.