Economists like deLong are obsessed with the idea of ever increasing growth to justify the assault on the lifestyle of working class people. A 1957 US middle class family with a sole bread winner (union job) makes for a very uncomfortable comparison with 2017. Thus the need to focus attention on products and technologies that weren't very advanced 60 years ago.
Frankly though modern houses, automobiles, indoor plumbing, central heat, washing machines, vaccines, 50's era medicine, were a vastly larger jump in living standards than smart phones.