Integrated Notifications System
Something that would really separate Microsoft Teams from the competition would be integrated notifications. If there was an sdk/similar for Teams integrations (tabs & bots) to post to the desktop notifications and show a notification badge on pinned tabs, it would make Teams much more powerful.
One of the current issues I have with Teams is keeping track of everything I need to work on. For example, my Team uses Trello and we have been taking advantage of being able to pin boards to a chat. The problem is, I have notifications in Trello (which are not available in the Teams integration so we use the website tab instead), but across multiple chats I don't get any notification without either looking at a Trello tab or the team needing to chat to get everyone's attention.
In the end, any feature set in a chat/communication system is only as good as its notifications. If I can't respond quickly to someone trying to communicate with me, the tool becomes a hindrance instead of something enabling.
Hope to see this upvoted, keep up the good work.