The ability to group Teams under a folder.
There is currently no way to group Teams. You can pin a team to the Pinned group, and then all other Teams show up in a single "folder" called Your Teams. You can also hide a team, which then assigns them to a group Hidden Teams.
In our case, we would want a separate Team for each client. But with many clients, plus all of our internal Teams, there are a LOT of Teams and it is very unwieldy to manage.
The proposal is to allow users to create additional groups inside of the Pinned, Your Teams, and Hidden folders.