I think a good middle ground is to allow people to request a waiter if desired, or order directly using a device. At a nice restaurant, I may want to ask the waiter for a recommendation or I may want to explain food allergies (assuming I can't do this in the app). But at Chili's or IHOP, I know exactly what I want, I can request no waiter, order through my phone and pay through my phone. Of course someone will still have to deliver the food and refill drinks, and address any issues, but maybe you can flag someone down (some Korean BBQ places have a button on the table that flags a server), but you could cut down on the number of times a waiter needs to come to the table (get drink order, get food order, bring check, bring signature receipt)