Dunks are very cool but they don't determine how good you are in basketball, it's all about the fundamentals and the process of repetition.
I think I can answer ur question tho,
Somali parents don't necessarily see sports as a career while ajnabis parents start their kids out very young in sports. Almost all NBA players with the exception of African players discovered in their teens, all started off in kids leagues and balled every single day until it was second nature to them. They got trained by the best coaches, played for the best schools and competed against formidable talent.
Even with that said, there are thousands of young men who went through the same grueling process and don't make it beyond college in the pro league, many go off to g league ($80K) a year or overseas like Europe and china where they make a little more.
It's definitely a lifestyle and very rare just to pick it up one day and dominate in no time (although it happened i.e joel embiid/gianis adetokounpo
