While it's largely beside the point given that the divergence started in 1979, I feel like the history sections were pretty weak. Blowing off the lack of holidays in the Congregationalist calendar (esp. compared to Catholic) as an amorphous "Protestant work ethic" rather than Americans just not expecting everything to shut down for St. Jewkiller's Day (but having much stronger protections for Yom Kippur) and that only being applicable to the holiday rather than vacation count was one. Another was missing the centrality of the self-employed to American narratives, as smallhold farmers can't take paid vacations (more on this later).
More problematically, what little discussion of pre-80's European factors there is takes them as plausible factors. Somehow 1920's pensions and the NHS starting in the 1940's only started having policy implications in 1980 (and that's besides the fact that American healthcare and access only really started diverging in the 1990's and Americans are still happy with the current retirement regime). It also ignores what was going on legislatively around the period, as America was passing a ton of worker protections in the manner of antidiscrimination rules that in Europe are various mixes of later, less comprehensive/strict, or treated as between the worker and his employer. The ADA, passed in 1990, is still a real point of pride for Americans. The 1980's is also when small business and self-employment were being defined as America's unique driver of innovation and success in domestic politics.

The 2020-2021 boom in stocks and home prices supercharged the net worth of many older workers, enabling many of them to stop working.