I think I have to agree with OP here. To me, Teams is more of a failure of product management/design and corporate culture. It was more of a move to add value and subscribers to the Office365 platform than an attempt to build a world beating chat/conferencing platform. So many of its users simply use it because it's included in their Office365 subscription, whereas with Slack, Zoom, etc they'd be paying $8+ a month per user.

While the development effort, skill, and time, that goes into building something like Discord is certainly significant, I feel it's certainly something Microsoft could have built given their resources and technical aptitude. What you can't buy is the inspiration, ideas, and culture that make something like Discord happen.

If it follows the inspiration and ethos of tools like Github and VSCode, I'll be really happy. Given Microsoft's shift in attitude over the past few years, I really hope that's the case.