The world has hope, but we are really constrained.

The correct advice is "make the best of what you have and are" and not pie in the sky "you can do anything".

And yes, it's because you cannot meet everyone or even afford to try every educational path to learn who they are and their language. Or sometimes even move out of country, and even when you do, the are costs.

Ultimately you have to run a cost benefit calculation and many benefits are big gambles in reality.