The simpler the better. In my limited experience once we started fleshing out users to admins, managers, and users, in a multi-tenanted environment, we pretty quickly ran up against Cognito limitations which surprised me.

(Cognito groups seemed made for this, except they have a limit of 10k groups. We ended up storing a comma-separated list of ids in a custom cognito tag, which seemed awkward.)

Oh it can be!

but the documentation is utterly pitiful