You didn't even mention XMPP.
exactly. I would add that not only is end to end encryption not enabled by default, but it's not supported for group conversations.
for anyone interested in more details:
https://juraj.bednar.io/en/blog-en/2022/04/29/encrypted-messengers-how-to-communicate-privately/
https://juraj.bednar.io/en/blog-en/2022/05/03/encrypted-messengers-comparison/
nostr:note16zscwhfdpscg95xn7zlucmjcprnjr2pa4jz2se833vhmfs4xmgsq88nnx8
Discussion
because it's dead.
I was an early user of it, but then for years I had no active contacts there
If XMPP messenger wants to be user friendly / to have expected features, it has to implement a lot of extensions (XEPs) where many of them are in "draft" state past 15 years.
Tried to find multiplatform client other than pidgin (a lot of troubles), but failed.
Extensions are a good thing, just like nostr's NIPs.
Pidgin is not the best client around anymore. Try Gajim or Dino. And Coversations on Android.
Tried gajim few days and returned back to pidgin. I just need organization of upen chats in vertical oriented tabs.
Anyway, I need windows/linux client - to have just one sw supported by our it team.
It has evolved a lot in recent years.
Don't let popularity be your only metric. The protocol is sound, secure and privacy friendly, the ecosystem is alive and healthy, and the clients and servers are in active development.