Well, the US GNI is also higher than that of every European country minus the microstates, Norway and Switzerland.
Partly because even though productivity is comparable, Americans just work more (longer hours, fewer and shorter holidays), partly because the system is just more efficient: single market, just 1 language, great centralized soft power that opens many doors.
Doctors are paid around a 1/3 of what doctors get in the US
Nurses around half
Lawyers vary, but quick googling suggests it's around half to third
Finance, insurance and real estate pays waaaay less
Store managers at Walmart get about twice as much store managers at Lidl Europe
The skew in upper management pay is even higher
and on and on...