I will not use a system with snap and has nothing to do with being proprietary.
One of the reasons that I could not use Ubuntu is that I cannot control using snap or not. They even use it to install apps that you install via apt.
The fact that the only time I did use a system with snap left me with the impression that it is an absolute performance pig certainly does not help.
Have an upvote. I use Edge on Linux every day for Outlook and Teams. I do not really use Office online to create my own docs but, if there is an attachment in an email, I use Office in the browser to view it. It all works well enough that I hardly think about it.
It used to be that Edge was the only browser that worked well for Teams. Ironically, with the latest update to Edge, my webcam stopped working. I loaded Teams in Firefox and it worked fine. There are other reports online of the same problem and Microsoft posted that they are working on a fix. So, Microsoft managed to break Teams compatibility in their own browser and it seems that Teams now works fine in Firefox. At least, it did for me.