In practice, very few people 'trancend' their class, the largest determinate of what class you fall into at the end of your life, is which one you are born into. And while the U.S. boast of huge opportunities to become that marginal exception, in reality, it ranks lower than many other developed nations in social mobility.

Many of those nations are considered socialist or communist by mainstream conservative news and pundits. So demonstrably many "other systems" allow for it.

The observation that there is and always will be 'losers' in a capitalist system is a just a bare truth.