It's surprising businesses haven't turned to automation. At the very least, most of a restaurant's and a coffee shop's labor can be replaced with automated ordering, having the customer collect food themselves when it's ready, and using robots to prepare more of the food. they can do lattes with art all by themselves now. A lot of these businesses just can't survive if they meet the wage demands of people who have be…
Also those kind of seat yourself / serve yourself places exist, they're called fast food typically. Look at mcdonalds, chipotle or subway for example. That setup is actually very old, from the time before computers.
Places that serve alcohol like waiters although, because they are essentially alcohol salesmen that boost sales, and alcohol are big profit drivers for restaurants.