Delivery drivers don't use doorbells where you live? What do they do, call you instead? That seems odd to me, even Fedex and UPS ring my doorbell when dropping off a package.
To be precise, it's Chicago. Being in the city means most deliveries will be to apartments. The door buzzers are often unlabeled, mislabeled, or just broken. But even if you're in a townhouse with a door facing the street, most drivers are firmly in the habit of calling.