Delivery makes sense for another reason: delivery services could have mechanisms that don't make sense for individual people to own, such as dollies or carts to get things from a vehicle to your door. (Due to the current over-reliance on gig-style delivery people using their own vehicles, rather than dedicated employees with specialized tools, this often doesn't happen today, but it should.)
In general, it makes a huge amount of sense for a specialized employee with specialized tooling to pick up groceries for many people and deliver them; the net result is less total person-hours spent shopping, less vehicle miles driven, and less overall labor.
In general, it makes a huge amount of sense for a specialized employee with specialized tooling to pick up groceries for many people and deliver them; the net result is less total person-hours spent shopping, less vehicle miles driven, and less overall labor.