>A lot of that pressure, oddly enough, comes from the necessity to keep shareholder returns high to keep the retirement accounts of the Boomers flush with cash.
This is it. The American economy has been warped by the interests of older people who are more interested in keeping the wealth that they've accrued safe than in investing in ventures that are riskier but that provide a broader and more diverse base of opportunity. When you ask, "Why are so many young people unemployed or underemployed today?", it's because cash, which could have funded the investments that stupid young people would have made in risky small businesses that employ workers with idiosyncratic or less-than-expert skill sets, were instead placed in the hands of boomers who just bought more FAANG stock.
Suddenly, those huge conglomerates are the only ones with capital, so they bid up wages and costs to keep resources out of the hands of would-be competitors. This creates a cycle of "growth" (or, rather, when the organic growth subsides, government steps in with subsidies because they can't let the largest employers and economic engines in the country do poorly).
And here we are.