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A thing I believed even before our whole working lives moved to video chat: the best way to end a video call is a sustained hand wave while hanging up. Clearly indicates you know you're on video but the call has concluded. It's not weird to cut off mid-wave 
One of the reasons it's so exhausting meeting on video is because there's no backchanneling - those nods, uh-hus, and looking at a person to let them know you're engaged. You're just pouring energy into a vortex. My guess: platforms that resolve this well can be market winners.
We're amazingly sensitive to our audience in face-to-face conversation. Turns in conversation happen so fast that even small amounts of lag through chat can be difficult to negotiate. There's a nifty little Language Log experiment on these time delays: https://languagelog.ldc.upenn.edu/nll/?p=47106
I'm grateful that @GretchenAMcC and I have had lots of practice at navigating time delays while recording @lingthusiasm - but for episodes we have the luxury of editing out the extra pauses we build in to give each other a chance to talk!
