Also, on a purely pragmatic note, capital is mobile. If you penalize the rich, they just move, and then the new system will stop class mobility.
Also most easily available statistics are from 2020. The US economy has been a massive winner post-Covid and has diverged a lot from some countries.
This website should be a good example. The typical Sr Software dev in the US would be in the top 1% to 0.1% of earners in European countries and Canada. The US has more millionaires than many entire European countries have citizens.
A top 10% earner in the US would be in the top 1% in Canada. An AVERAGE earner in the US is about top 10-15% in Canada.
Class mobility (or social mobility) indicates ability to go from lower to middle class, working class to generational wealth, etc... All income statistics show the US as having a particularly large amount of high income earners, self made millionaires (and billionaires), etc...
My priorities do not align with your postulating
Support ambition all you want - just don't come crying to us when the B2C market dries up entirely.