The only question is whether a person who has received an education can then realize his potential within his own country, or whether he has the opportunity to go to another country and realize his potential there.
Unfortunately, there is a good "bad example" - the USSR. It seems that education was not the worst, and even higher education was not bad - many students came from many countries to receive it. But for the local population - the inhabitants of the USSR, there were actually no ways to realize their potential! Yes, there were some institutions that designed something, developed something - but 99% of it was primitivism, which turned into a strong technological, industrial, medical and other lag behind developed Western countries. And initiatives - if not punished, then "put in a folder", and then they forgot about them ... And one of the reasons is the lack of a normal competitive market in the country.