At least for Postmates here in Portland, the delivery person also places the order at the restaurant. They are responsible for the order, not just the delivery;

At least for Postmates here in Portland, the delivery person also places the order at the restaurant. They are responsible for the order, not just the delivery; they can take the minute to check what they ordered is complete. If they don't do a complete and great job why should they be entitled to a great tip?