Knowing how much food+service costs up front benefits the customer by allowing them to make an informed decision.
Having a higher pay benefits the workers by making their income consistent and allowing them to more easily compare salaries offered by different restaurants.
Tipping in its current state benefits only the owner by lowering operational costs and forcing the workers to depend on the generosity of the customer, conviniently making workers feel like they are getting shafted by the customer instead of the person who actually hired them.