A lot of the people who admire the caricatured midcentury economy are probably actually just nostalgic for the '90s. Case-Shiller was much lower, gas was cheap, college was still relatively affordable. The biggest economic complaints of the present day were not as serious then. (There were still affordable parts of the Bay Area!) The subjection of black people and women that existed in the 60s obviously wasn't necessary for those things to be possible.

But each decade's economy is the product of decades past. The policies of the 90s brought us to the present. So we don't want to repeat the mistakes of the 90s, and the 80s are associated with the iniquities of the Reagan administration. Thus you get this misplaced nostalgia for the 50s-70s without really understanding the problems or the progress that society made even as the highest levels of government seemed to drift off course.