There is three huge questionmarks that comes from… someone could say features of private chats but I’m still calling them (sorry) design flaws.
If anyone, including admin, leaves the group chat there is no another way come back than someone is inviting.
There is no other way delete such chat than everyone has to leave it by own will.
Because it is another private chat where groups are just users (as should, that is good) but used when such channel is opened then eveyone can invite who ever they want (disclaimer: I did not test this, but I’m quite sure of that)
So… this feature is really promising but from my point of view this so far away from ”production ready” that I would use it. Such it is now it has few pros for small groups of users but because groups are behind admins so… for users everything is as earlier. And kind of at staff level (in wider meaning than just Discourse lingo) there is too many cons.
And yes. I may, and propably do, see this too limited way.