> which is what Matrix uses for voice

Matrix also has its own voice/video, but it's not considered entirely ready for prime time yet, hence the Jitsi embeds.

Matrix uses its own voice/video for 1:1, which is very nearly ready for prime time (we've been iterating a lot on it over the last few months, and are about to declare it open for business).

We embed Jitsi for voice/video conferences, but we're experimenting more and more with native Matrix conferencing over the course of this year.

Aha I wasn't aware of that, thanks for enlightening me! I didn't know there was built-in conferencing at all. This is great!

That would have removed a large piece of the competitive edge for them. You don't swap out your core advantage.