This was a single instance of a wider phenomenon occurring in the US under Roosevelt’s New Deal, which was on one level a grand political exploitation of new technologies. FDR sought to rebalance the economy and rescue the country from mass unemployment through public works, which were only made possible by rapid technological advances – not just the advent of electricity, but the engineering techniques associated with highway-building, hydroelectric dams and other major infrastructure.
As Keynes himself pointed out the unemployment was caused by advancing technology in the first place.
And as to the underlying idea. We should be progressive by protecting Britain’s professions?