It has to do with the timing of it, like gp mentioned. Current best practice is that that waiter should come by within a couple minutes of the food arriving to top off water and make sure your first bites were as expected so that any problems can be fixed early in the meal.

This is much preferred to a manager only hearing about a problem after all the food has been eaten or the customer has sat staring at a plate with unsatisfactory food on it while their companions eat (making everyone less comfortable as generally humans don’t like to eat when others haven’t had the opportunity to).