Earlier quoted context omitted.
Core XMPP is decentralized today . Room chats standardization in XMPP started 20 years ago. Any server existing today has solved the issue whatsapp is facing right now.
It has decentralization today , but also no users today . I would be happy with it but my contact list quite empty. I'm not outright rejecting XMPP. I would like it very much to just use XMPP, but something needs to happen. It needs to be easy to use, friction-less, have all the fancy features and probably more to sell than Signal, Telegram, WhatsApp, Facebook Messenger and Matrix at the same time, which is no small…
I can't claim it has exact feature parity with Signal/Telegram/WhatsApp, but it has all the important stuff and is good enough for my family to use daily. It also has some advantages, such as not requiring a phone number (which e.g. means that my children can use it on the old "living room tablet").
Snikket counters the "empty contact list" problem and the network effects by focusing on small groups like this, automatically including everyone else in the same group(s) in your contact list. It helps a lot.
The ultimate goal is that we get enough such small groups operating on open networks, eventually the members of those groups will find they can communicate with each other. It's better approach than isolated individuals using XMPP/whatever with empty contact lists just because they believe in it.