Ehhhhhh I like Europe, a lot, but when you're in you're 20's or 30's and looking at $300k in SF or €80k in Paris (and better access to investment products and lower taxes in the US to boot), suddenly clocking off at 16:00 on Fridays doesn't seem as nice as being able to retire in your 40's.
Most American's don't have that opportunity either or don't want to make the sacrifice of living in soul crushing circumstances.
300k in SF or NYC is FAR from early retirement unless you live 'frugally' - Manhattan average rents are 5K for 1 bed. You pay city, state and federal tax. Food and alcohol are 30-50 percent higher than Paris. And no one talks about property taxes.
In the US, local and federal taxes plus property taxes are easily 50-60 percent of your income.
Inflation runs higher in NYC than the rest of the country, as well.