You think the manager has better things to do than observe their employee's performance? Isn't managing personnel just as important as managing, say, inventory?

You think the manager has better things to do than observe their employee's performance? Isn't managing personnel just as important as managing, say, inventory? Isn't the manager's job to make sure the customer is well served? The manager, for example, can observe if the employee is the problem or the customer. I've observed customers (from the outside) fly off the handle for no reason whatsoever. An employee shouldn't be paid less because the person they are serving is awful. They also shouldn't be paid less because the back of the house is short staffed so the food took an hour to be cooked, because people will tip less for that reason. Also there's the people who believe "good service" means being served by a young attractive woman who smiles at you. I'd like to know what good service means to other people. Good service to me is you take my order and bring me what I ordered.