Same with a doctor, lawyer, accountant, refrigerator repairperson, gardener, painter, nanny, DMV clerk, bank teller, and the person making your chipotle burrito

Same with a doctor, lawyer, accountant, refrigerator repairperson, gardener, painter, nanny, DMV clerk, bank teller, and the person making your chipotle burrito. Yet you aren't expected to tip them. I also find "bring me food" hardly more "personalized" than "scan my items and take my money." The times you tip are when it's socially acceptable to tip, there's no "rules" you can apply that make any sense.