When enabling the Teams license in Office 365, every member within the organisation can create Teams. To prevent uncontrolled growth of Teams, it is a best practice to disable the creation of Teams and put in place a provisioning engine instead.
While Microsoft has been promoting the usage of metadata and views above folders in SharePoint document libraries, Microsoft Teams lacks these possibilities. It gives you a full list of documents in that document library, but with no metadata, no views and no filtering.
Microsoft Teams brings together the full breadth and depth of Office 365 to provide a true hub for teamwork. Word, Excel, PowerPoint, SharePoint, OneNote, Planner, Power BI and Delve are all built into Microsoft Teams so people have all the information and tools they need at their fingertips. It is available for Office 365 Business Essentials, Business Premium, and the Enterprise E1, E3, and E5 plans.
It puts itself in a strong competitive position against Slack.