But little to none of it had anything specific to the middle class. In fact, you fail to even define what "middle class" means. Hence the reasonable skepticism to their relevance to an argument against a stagnating middle class and the reasonable conclusion about their randomness.
If you looked at the square footage per person data detail link I posted, there is a clear and unambiguous shift to the right, by about 100 square feet, of a curve plot on square footage per person. Obviously, however you want to define the middle class, it must also include a definition consistent with this data.
However you want to define the middle class, it would still be consistent with the fact that the median household now has 2 instead of 1 vehicles while at the same time, the average household size declined by 10%.
However you want to define the middle class, it would still be consistent with the fact that nearly every SES group lives about 4-5 years longer compared to 1980.
However you want to define the middle class, it would still be consistent with the fact that the air that all people breathe is cleaner by about 62% of the six most common air pollutants.
However you want to define the middle class, it would still be consistent the fact that overall crime rates are down 50%, and it would be incredulous to the extreme to believe that such group does not suffer much lower crime victimization rates given this significant reduction in overall crime.
However you want to define the middle class, it would still be consistent with the fact that vehicle deaths are down 66% per vehicle mile traveled, and that the car fleet as a whole has had a significant safety improvement from 35 years ago.
However you want to define the middle class, it would still be consistent with the fact that workplace fatalities and injuries are down significantly.