Not a very good list.
First of all the OS shouldn’t really matter, most orgs will probably have the problem of using all 3 major platforms, maybe even + iOS + Android for tooling.
Also how many people are in that allhands? We use Teams for that (because it’s the default). I’m not saying I’m 100% happy, but for an allhands with 5 people speaking and 100 listening, it at least works.
Some might consider a list of applications that route data to/through Microsoft and friends to be ‘not a very good list’