Groups: How to apply?

Based on a couple of pages of docs, and previous support conversation, I have been able to create groups, add users to them, assign permissions to a group, and so on.

However, I'm not understanding how best to apply them in practice.

The central problem is that apparently a Group and its membership roster belongs to a user , it's not a feature subsidiary to a wiki.

This seems to mean several rather problematic things:

Only the user who owns the group can invite members to it (and also remove them).
If the user who owns the group cancels their account, then the group disappears with it, and all the members lose their permissions.

To prevent groups from disappearing when an admin moves on, it might make sense to only allow groups created by the wiki owner. But then only the wiki owner can add (invite) and remove members from groups, since they are all owned by wiki owner.

This seems to defeat the purpose of having admins in addition to the wiki owner, to help manage users. Admins can provide permissions to individual users, but they aren't able to add (invite) or remove members to/from the groups that the owner has created.

Have I missed something here? Is there some other kind of group that I've missed, that's tied to the wiki itself, instead of to a personal account? Or some way to share ownership of the group?

Thanks,

- Graham

Issue: GWZ1012