[chriswarbo]

I get the 'different philosophy' part, but I don't understand why their list of 'problems with XMPP' includes things like 'second-class citizen', since Matrix itself is a second-class citizen compared to XMPP.

They might as well list 'Can't talk via Skype' as a problem with XMPP, since it's just as true and Matrix is just as incapable of solving it.

As for 'requires plugins/extensions', if you think that's a problem then there's an easy fix: define a new protocol as "XMPP + the following extensions...". That requires some effort, e.g. to get servers and clients to support this new protocol, but unlike a "clean break" it wouldn't require much technical or social work.

I especially enjoyed the "no open source implementation exists" reasoning; no open source implementation of Matrix used to exist, but that didn't stop the developers ;)

[qwertyuiop924]

Yes, but Matrix being second-class to XMPP isn't inherent. Things in XMPP being second-class or requiring extensions is.