When n Scrum teams are working on a product, there are n Sprint Backlogs but only 1 Product Backlog.
Scrum Teams are self-managing, meaning they internally decide who does what, when and how.
The Definition of Done is a formal description of the state of the Increment when it meets the quality measures required for the product.
When the team becomes mature enough, they may improve their Definition of Done.
Does it replace the importance of empiricism in Scrum to forecast the Sprint progress using burn-down charts?