@claudiom I fully understand your PoV but my job is actually to promote Open Source and interoperable platforms which also protect our data and privacy.
I may be able to fix Teams on Ubuntu but it won't fix the fact that my kids data is going to Microsoft and eventual third parties and that's my issue.
We have the solution, it works perfectly on every device and it can be hosted by anyone reducing our dependence on third parties for critical services.
Thanks anyway for the info.