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Hangouts on Air has a bit of functionality which a lot of streamers value highly: The picture will automatically change to the speaker.

Is there any other software that does this as well as Hangouts on Air does?

Zoom

Zoom has a lot of UI/UX problems

Compared to what?

Compared to any app that does not secretly install insecure spyware.

Based on who's speaking? FaceTime kinda does this.