Project Online: Use Case(s) for the "Team Leads" Role

Hi Community,

I'm not entirely sure what a use case for the Team Lead role is.

The microsoft site says: 

• Team Leads Users have limited permissions around task creation and status reports. This group is intended for people in a lead capacity who do not have regular assignments on a project. This group is associated with the My Projects category.

Could you provide excamples of use cases, how this role comes into play?

thank you

Andreas Raupach