Team address books (and company-wide address book)
The lifeblood of Microsoft teams is the people that that make up those teams and generate the content within teams. As of now, there is now basic way of listing who those people are within teams.
It would be really great if each team had it's own "people" tab where it would be an address book of all the people who make up that team. Without it, how does a general user even know with whom they are speaking?
Furthermore, it would be good to have the option for a company-wide "people" tab in the left menu, which would function as a general address book.
These features are out-of-the-box options for most other company communication systems and I don't understand why it's not really an option.