I have a similar mental model, but Teams the way we use it is more of a replacement of Slack than Zoom. It's a huge app in terms of features, and it covers both segments, so it's not really a clean divide there.
The only reason it's so ubiquitous is the office/outlook bundling sold to most companies.
It a chimera that's the outcome of multiple grafting procedures And no matter how much makeup it still show when you use it long enough.