Yea I think you describe it well there as "heavy" it doesn't feel agile. The whole concept that a single login is more fluid only has a little validity because when you login to a suite of apps you feel so overwhelmed. Logging into slack means you're logged into slack. Pretty simply and light.
Yes. I wouldn't know where to start, if I wanted to open a Team with some friends. But in organizations where they already have an Office subscription, and an IT dept to manage the tenants and accounts ? People will love it :-)
