Unionized labor falling off in America is also directly correlated to why Americans have lagged the world in work benefits. When unions get benefits for their members they tend to be applied broadly to everybody because it's just easier. So many of the benefits that American workers have historically enjoyed are because of unions and progressive politcal movements not because companies felt generous or the so called free market mandated better benefits.
Some big companies (including ones I've worked for) also offered fairly generous benefits because they were terrified their employees might start whispering the 'u' word amongst themselves if they didn't. But that arrangement only works if the threat of unionization exists to begin with.
Silicon Valley fears their engineers unionizing like crazy. Engineers produce so much value and the people who run Google, Apple, Microsoft, Amazon have paid them well but also never paid their true value since their economic output is outsized. Apple and some other companies were even caught colluding to depress wages and not higher each other's employees despite the high pay and benefits they offer.
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