[internet_points]

In my experience, waiters tend to be quite good at splitting bills. I feel like many of them remember what people had, maybe they get good mental maps of seating or person <-> meal type just like taxi drivers used to get good mental maps of London before GPS.

(And printed menus tend to have allergy info too, just like online menus sometimes don't.)

[duskdozer]

They have systems where at order time, they can enter the items each seat bought, and then print out separate checks at the end.