Just tried this on the latest RC (0.99.126.4.1.7-rc) and it seems to be working fine.
It was a bit artificial test because I've been calling myself (between MacBook and iPhone), but both the audio, the video and screen sharing seemed to work fine.
Will try to use Orion during some of my team calls this week, let's see how that plays out, and whether I would be able to finally delete Arc from my computer π