This is equivalent to an article arguing that 50 mb/s internet isn't fast enough and every community should be offered 100 mb/s internet, even if doing so causes large net losses to the providers.

They don't produce any evidence that the difference between one day and two day shipping has a negative impact on people's ability to increase the amount of available goods and obtain them at lower prices. Is there some mysterious perishable, necessary good that can only be ordered 24 hours in advance that unlocks upward mobility?