The company’s core promise is failing when we need it most— and that could wean some of us off our Prime habit

Its by now something like accepted wisdom that Amazon.com Inc. could be one of the few firms to come out ahead in the wake of the coronavirus pandemic. But all is far from well in the kingdom of Bezos. At a defining moment for the company, it is letting customers down.
True, all retailers are under enormous strain, and the Amazon boxes keep arriving. But the promise to ship anything to our doorstep in a day or two that has gained it the trust of an astonishing 112 million Prime members in the U.S. (a nation of 129 million…