Lora-Chat-Device VS Movim

> then try to find your contacts again (which may be cached by your client or not)

You can save XMPP account IDs in any mobile address book.

> Finally, you have to convince "someone" that this is just you with another account on another server. There is also no verified E2EE anymore.

I'd pretty much just do a video call at that point.

> How is this different from "when Signal goes down one uses a completely different instant messaging system", apart from using another client?

You don't have to use another client software.

> Which means: If one of these hosting companies blocks XMPP traffic (e.g., if a rogue state starts censoring) or one of these XMPP servers goes down, a huge part of XMPP users is affected.

Equally applies to most messaging apps out there. Some XMPP apps have the benefit of also supporting using Tor and hidden services - Signal/WhatsApp/etc, don't.

Don't want to use the Internet at all? You can even go wild and do something like: https://github.com/ddamianus/Lora-Chat-Device - I realize this is something most people would not do, but XMPP's _flexibility_ allows this to be an option if it was something people wanted. Can't do Signal over LoRa.

When https://siskin.im/ is seriously touted as the best iOS client for XMPP, you already lost 50% of the market share in the US. And if you don't have any usable app for 50% of your users in one of the most important markets, you can not really claim "interoperability", can you?

Don't get me wrong, it would be great if more people were using XMPP. Now that I am more involved in the Fediverse space I'm learning how many wheels are being reinvented and XMPP has already solved. If more people learned about https://movim.eu I'd be able to shut off Communick and move on to do something else to do with my life, but the reality is that XMPP failed to achieve critical mass because it never had someone to complete control the protocol.

Let me put it in another way: of all the existing projects out there, which one does actually bring material benefit to the users and publishers compared with, e.g, Mastodon, Matrix, Movim or Nostr?

Any Thinkpad will do the job. I'm working daily on a T430 and X220 for both my personal and professional web dev work. I've been developing Movim for more that 10years on the same computer https://movim.eu/

For social networking atop XMPP, see https://movim.eu/

Combined with the in-development ActivityPub gateway from Libervia, interop with Mastodon, Pleroma and others becomes possible too. The decentralized social web space is quite active at the moment.

If you don't care at all about poluar figures and just want to share content with people you actually know, https://movim.eu would be a much better alternative.

> No registration needed for group members

This one is the most troublesome I think.

Usually this is in a conferencing solutions though, so no such thing as chat rooms, I think.

Otherwise I would suppose something like XMPP with a web frontend, eg https://movim.eu/

ejabberd supports anonymous users, though I can't say if movim or any else web-client supports that natively

https://www.ejabberd.im/Anonymous-users-support/index.html