It doesn't even need to be the most feature-rich any more. Microsoft has figured out that the key is corporate licensing.
Is Teams better than Zoom? No, but my last employer ditched Zoom because Teams was already included in their enterprise license package and they didn't want to pay twice for the same functionality.
I'd imagine perhaps this is how product teams are assessed - is the component just-about fast enough, and does it have lots of features. So long as MS Office is the most feature-rich software package, enterprise will buy nothing else, slow or not.