>How is it working for the US to have every company mostly owned by the general public's retirement funds?

It’s working quite well for retirees.

> Because Marx theories do not hold up to reality

Sure, but ownership being the root of inequality was the one thing that he was actually correct about. CEO to worker pay ratio is something that is completely irrelevant. Companies spend orders of magnitude more money on its shareholders (dividends, buybacks, and reinvestment) than executive compensation.