screenshare via browser
To screenshare/powerpoint share in a Teams meeting from any browser (preferably without need to download anything). Currently only possible in Teams client, not even Edge.
If you don't have this, non-365 externals probably can't present. Requirement to download the client is a barrier for anyone, especially if you realise as you're trying to join the meeting.
This is incredibly important, as you cannot assume externals have the Teams client. I see it as a critical path item to cut over to Teams from Skype, and currently a show stopper. It's a feature in Skype so the expectation is there.