Shared information thru Teams
Shared information should not be stored within OneDrive or SharePoint that require or don't require access. A P2P should be simple IM between 2 or more recipients, along with the files between. A Teams Chat should also only store shared info within Teams app and not OD or SP so to alleviate access issues on OneDrive.
Teams is far from Slack to which it is attempting to be competitive to.