What you are describing is not team service because the server "owns" the customer and are the one who will collect the tip from that table.
What you are noticing is that many chains have a "full hands" rule: if any server with free hands walks past a table with dirty dishes on the way to the kitchen, they are expected to pick them up no mater who's section it is. Also, if they are heading out from the kitchen with free hands they are expected to run out some dishes no matter what table they are for.
What you are noticing is that many chains have a "full hands" rule: if any server with free hands walks past a table with dirty dishes on the way to the kitchen, they are expected to pick them up no mater who's section it is. Also, if they are heading out from the kitchen with free hands they are expected to run out some dishes no matter what table they are for.