When you are a talented child born into a bad family, your success is to go from £1 to £10M.

If you are a talented child born to a millionaire, your success is to go from £10M to £1bn.

If you are a dumb child born to a millionaire, you go from £10M to £1.

You probably assume that people with the same skills should have the same absolute outcomes. I don't. There shouldn't be glass ceilings for talented ones, so a son of a carpenter has a right to become a billionaire, or earn a Nobel Prize in science, or apply his talents in any field. But I don't think there exists any socioeconomic system that would deliver more equitable results and had more pros than cons, especially compared to the current system.