One thing I also noticed is that good audio quality really improves things. Even if the current audio quality doesn't consciously register as bad, low quality leads to much more exhaustion over a longer period of time. This can be observed when someone switches from a bad internal laptop mic to a high quality headset. The voice is so much more easy to listen to.
It's much more important to just ban Bluetooth. And also wired Jabra headsets that inexplicably still sound like Bluetooth. No more tin can sound, no more dropped words when someone starts talking. Yes, even an internal mic is better in this regard, though it will have problems with echo cancellation.
In addition to audio quality, people have _constant_ problems with their audio setup across all platforms when using Bluetooth. I've gotten to the point where I will just outright buy someone a plain USB mic just so I can consistently get them on a call without 10 minutes of fumbling audio interfaces.
Unfortunately, even after buying them a USB mic + explicitly banning Bluetooth on calls I still catch devs trying to use their fancy Bluetooth gaming headset (or whatever) which can easily push meeting start times back by 5-10 minutes.