has something to do with values systems. Each generation has its values. Before colonialisation skills were prized -iron smithing, cooking, herbalists, hunting, raiding/rustling, bush clearing- a really productive artisan class existed and thrived. Come missionaries and settlers with western education embraced by weak and lazy who couldn't do the tiresome/risky work which required skills. This educated group thrives and artisan class dies, they value education (1920-1990). With IMF, Pattni inflation in 90s the changes are well captured in the article- a class 6 dropout hawker/makanga starts making more than a teacher/nurse. The generation born by the hawkers/makangas are now grown ups talking about hustles and deals. A generation ready to do everything dirty and clean to make money as the educated have some values, lines they can't cross.
But still we have million kids in school - education still one of the best bets in poor countries. There can only be countable loud Zuckbergs, Gates, Sonko, Karume among 7 billion people.