What’s changed is that now it uses the recently added webxdc real-time P2P channels, so now there is no 15-second delay (now it’s around 1 second), and you can actually do calls over it because of that (but remember that it’s still just a prototype).
Usage: 1. Enable “Realtime Webxdc Channels” in Delta Chat advanced settings. (it’s enabled by default after the 1.48 release).
It remains quite beneficial, as it allows for the convenience of not having to set up meeting services like Jitsi oneself, particularly in an internal network environment.