It's popular to claim that wages have gone nowhere for ~40 years, it's never supported by the actual data. The premise requires that one ignores the cost of health coverage in the US that is commonly paid for or heavily subsidized by an employer (the employee would have to pay far higher taxes for that otherwise, given the per capita healthcare cost in the US is now ~$11,000 -- $33,000 for a family of three). It ignores pretty much every benefit that employees receive today, that did not exist in the early 1970s, including 401k matching.
If companies weren't paying for healthcare benefits, the employees would see their taxes skyrocket. That's a dramatic, obvious, direct wage benefit. In socialized systems such as are common in Europe, the companies do not pay nearly so much for healthcare coverage, instead individuals pay far higher personal taxes, while the average corporate income tax rate is low.
https://www.bloomberg.com/opinion/articles/2019-05-15/wage-s...