[eitally]

I think it's more than using Groups in the prior way was really more of a hack than an appropriate, mature solution for that piece of IEM, and now GCP has a product that's fit for purpose.

Fwiw, internally at Google, Groups is used for membership/access management in a "light" (self-administered for access to things that usually aren't particular sensitive) way, but for more serious ACLs there are other products. The nice thing about Groups is just that it's dead easy for non-technical users, and it solves the other problem which is retention of email content for longer than Google's retention policy -- IOW, tribal knowledge.