According to this 2021 blog article[1], MS Teams is undergoing two simultaneous overhauls:
1. Teams will use a shared, Windows systemwide Blink-based WebView2-based host instead of using its own private Electron environment.
2. The Teams' UI is changing from Angular to ReactJS.
So Teams will remain a modern-day HTA, for better or for worse, but sourcing from my own experiences working with Angular, ReactJS, and MS's WebView2 vs. Electron, I'm not convinced any of these changes will substantially benefit the end-user experience except perhaps a modest reduction in memory-usage attributed to using WebView2 instead of Electron.
Microsoft doesn't hire FTE SEs on the basis of their knowledge of a single platform or library - anyone who is good-enough overall will be able to familiarize themselves with Angular - or React - or any other framework, platform, or entire paradigm - that's how the industry works.
Employing people for knowledge with a specific library or platform can, and does, make sense, but only in a situation where a company needs a consultant or contractor(s) to make changes to an existing product for a short contract and then, poof, they no-longer work at the company.
While Microsoft does hire plenty of contractor staff (orange-badges, "v-dash trash", etc), only a minority of them are involved in product development, and an even tinier number of those are employed in any kind of consultancy role (which makes sense, considering that Microsoft almost entirely uses only its own platforms, frameworks and libraries for its consumer-facing products) - so the fact that Microsoft swallowed its pride and adopted Electron, Angular, React, Blink/Chromium in recent years marks a significant shift in the company's ideology (for want of a better word). No-one would have predicted this even as late as 2015.
1. Teams will use a shared, Windows systemwide Blink-based WebView2-based host instead of using its own private Electron environment.
2. The Teams' UI is changing from Angular to ReactJS.
So Teams will remain a modern-day HTA, for better or for worse, but sourcing from my own experiences working with Angular, ReactJS, and MS's WebView2 vs. Electron, I'm not convinced any of these changes will substantially benefit the end-user experience except perhaps a modest reduction in memory-usage attributed to using WebView2 instead of Electron.
[1]: https://blog.thoughtstuff.co.uk/2021/08/stop-saying-microsof...