Niel Liesmons on Nostr: 1) Private = generally nothing is publicly readable 2) Having your own relay + server ...

1) Private = generally nothing is publicly readable
2) Having your own relay + server should be incentivized but not required
3) It needs to be able to be a private group, not just a private chat, where every content type can have their own criteria for how long they can be accessed and who can publish them.
4) Leaking any key (except for maybe the groups key pair) should not be a significant problem
5) Ideally, if I share the group ID, you can only see anything about the group if that group lets you. (but I'm fine if that's a feature for the run-your-own-server crowd)
...

I can see a way of doing all of this with MLS, but it introduces so much complexity