You're losing the thread. There was a claim that capitalism was failing as a desirable economic system because median real wage growth slowed or stopped. I've always found this presentation of 1975 America as the height of the golden age before the fall to be transparently silly. Who'd rather be the median worker in 1975, and miss out on three+ decades of very nice quality of life improvements, even if their wages in real terms were the same?

But yummyfajitas helpfully pointed out that the median worker continues to see compensation gains, just tilted toward ones that take a tax-advantaged form.