I realize now you’re probably talking about a community-wide chat, so my comment is kind of off-topic. Given that Lemmy already supports a “Send Secure Message” button on someone’s profile that sends them to Matrix, I’d say there’s a pretty good chance of the Lemmy devs integrating some feature like this.

As far as advantages for my original comment, I’m mostly thinking that integrating them that way would mean that each client wouldn’t have to code its own version of chat, they’d just see comments come in from Matrix like any other comment posted the regular way.