The author is right about full duplex audio. My opinion is that manufacturers long neglected audio, incorrectly thinking that video and eye contact was the key to more natural conversation (the pandemic did do something to correct that, though)

We run https://cleanfeed.net/ to focus on full-duplex low latency audio (no video). Of course we are dealing mainly with studio environments and good quality equipment, making it a different challenge to a regular meeting tool.

But since the first prototype, we were using it ourselves as an "always on" line between developers. The ability to have 3 or 4-way conference in full duplex with low latency appeared to foster much more of a 'human' relationship than the meeting apps. The lack of picture may even have a positive effect, because it was part of privacy that made people more relaxed.