I think Teams as a chat and meeting app works just fine. But it tries to be too much. It's the everything app from Microsoft: apart from chat and meeting you can browse sharepoint online, edit o365 documents including vision and project, integrate all other kinds of apps, it also shares your outlook calendar which you can directly edit, you can use it as a browser or adress book and I'm sure there is a ton more stuff you in Teams. But that also makes it bloated and slow and it regularly requires multiple updates within a day.

It's handy, but they should streamline it a bit more. One of the first things I advise is to open office documents in the desktop app and have the teams folders as a shortcut in explorer.