i think they do it to look polite but its also a time where its unlikely that ull ask them for something
Because they don't want a lengthy conversation, just a decision, a nod of the head, a point of the finger at the dessert menu, or the food sucks and you the need the Heimlich Manuever, etc.<br />
Kind of like when the Dentist gets chatty when he's got his fingers in your mouth.<br />
They're really not interested in what you have to say.
Or how they always refill your drinks when you are about to leave?
Because they are *******
They just do. There is no reasoning behind it....
You can't complain or all for anything with your mouth full.