It's quite efficient use of land. Costco parking lots tend to be full, people tend to leave Costco with full carts and go once or twice a month. Direct to consumer warehouses should be encouraged not discouraged by the environmental social use advocate kinds of people.
It results in fewer miles driven and more being done per mile driven. Each parking space gets more done per parking space. There's less retail worker overhead and the people that do work are paid better and have a higher quality of life.
The problem isn’t the efficiency of car use, it’s car dependency. If retail is only available in the huge units it’s impossible to access those without a car. And if people end up owning cars, even against their will, they will end up using those daily.
The goal is to avoid the car-centric lifestyle, not to optimise it. Maybe that is a totally utopian idea in the us, though.
This is in comparison to the delivery center methodology by e commerce where the land use for delivery driver is somewhere further away from what is needed for community events, and every delivery truck is filled to the brim, way more full than what each consumer vehicle would be filled up with?