Productivity is up due to technology, not increased working hours. Americans work a lot less now than they did in the 1950s: https://www.humanprogress.org/senator-sanders-and-the-averag.... In fields where technology doesn’t help, productivity is basically flat for decades.

Likewise, capital’s share of GDP is flat since the 1950s and if you factor out real estate, has declined from 25% to under 20%. https://www.brookings.edu/bpea-articles/deciphering-the-fall...

I would also posit that moving far away from grandma and not being forced to socialize with mixed-age communities at church had a much greater impact on ordinary people than whether capital has 20% or 25% share of GDP.