If only Teams was developed by the largest stakeholder in the Windows native app ecosystem. It would be a perfect chance to show off native UI tooling that would make other companies want to develop for that platform. Oh well...
While somewhat true, to its credit Teams is using basically the same UI stack for its web-based product (teams.microsoft.com) and its "native" desktop app, so there's a win there.
Also, the Teams desktop app has moved from Electron to Edge WebView2 - which is a Microsoft product.