For me, the only possible explanation is that Microsoft had nobody with actual experience left. The entire Teams team seems to be cheap junior developers together with CoPilot.

It's not just that Teams is failing at solved problems, it's also that they aren't using Microsoft's own SDKs and APIs themselves anymore. Windows has good fast UI frameworks and all that cool stuff like SuperBoost which can make app startup appear instantly. Why is nobody using it?

And there is no useful integration to speak of. Why do I need to re-upload an OneDrive file into Teams? The exact same file is already stored on the exact same server. Does nobody there know about the magic of SHA512?

And how come if the internet has a hiccup while I upload a file, I have to re-upload the whole damn thing? In 1980 we already had resumable uploads via FTP.

Oh and who's the vendor creating one of the best performance tracking and optimization tools? Microsoft themselves. Did nobody ever dare to run this in a proper Visual Studio?