I can see the pros of the European approach, but reducing equality can not be the only goal. If the economy keeps falling behind, the median standard of living will keep dropping. A strong economy can adopt higher taxes and more social services due to election pressures. A fallen behind economy will find it much harder to jump back.

The other problem is that tons of European talent keeps going to the US. The people who have the skills to make higher wages might not care about inequality too much, since they would be the ones benefitting from it. I am not sure how Europe can solve that though.