> Because tips aren’t capped, waiters are motivated to go above and beyond to satisfy each guest. Without tipping, the server’s motivation often drops to providing only adequate service—more in line with the restaurant’s interests than with each individual diner’s needs.

Do people tip their accountants? Their nurses and doctors? Their dentist? Their mechanic? The cashier at the grocery store? The clerk at the shoe store who fetches the shoe in the size/colour I want?

Perhaps people should just do their jobs properly because that is what they're paid to do. And if they're not doing their jobs such that the restaurant/business suffers in its reputable they get fired and replaced by someone who will. (Kind of like how I have to do the job I'm paid to in IT or the company will act accordingly if I do not.)