People today can become wealthy, and wealthy people can lose wealth, much much easily than nobility was created or revoked under feudalism.
There's objectively more social mobility. That's an improvement. Don't confuse "it's an improvement" with "it's an acceptable and desirable end state".
How many people in the US have been born into a lower to middle class family, and gone on to make more than $10 million in the last 30 years?