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An error occurred while saving the commentDaniel Kåven commented
Just to comment on your second point.
Teams don't have the features of SharePoint, Outlook, Yammer, Stream, Sway, White Board, One Drive and OneNote. It combines them. Teams it self uses SharePoint for collective storage of data and OneNote is a separate tool where the information is stored in the same SharePoint.
OneDrive is a separate storage place for personal files. Yammer has a place for larger companies. Even if they incorporated some features directly in Teams it wouldn't make any sense as you will be limited instead of getting new or better features.
Teams is integrating Microsoft and 3rd party tools, which gives you what you need.