The foundations responsible for the protocols look to be pretty similar to me (both non-profit orgs), and would be equally recognized as such by the general public. Obviously XSF contributed XMPP to the IETF after 10 years or so, and perhaps we'll end up contributing Matrix to IETF or W3C or whoever too if they'll have it.
> How on earth is it innovative or new? > Since you invented nothing new, you evolve nothing.
sigh - I wonder if the XMPP community would spend less time constantly complaining about Matrix if they understood what it was :/
The innovative bit of Matrix is that it's a replicated database of objects (events), similar to Git, but designed for syncing conversation history around in realtime. The events for a given room get replicated over all the participating nodes. There is no central server responsible for coordinating the room; instead all the participating ones do so equally. It's impossible to communicate with someone on a different node without effectively giving them a lazy-loaded HA replica of the room. Architecturally this is about as opposite of MUC (or MIX or FMUC or DMUC or whatever) as I can think of.
It's NOTHING to do with HTTP+JSON versus TCP+XML - Matrix can use whatever transport and encoding floats your boat. For instance, at FOSDEM we showed Matrix running over CoAP+CBOR to try to spell this out: https://fosdem.org/2019/schedule/event/matrix/.