NA Historically just had a crap development path for talent.
Stuff like that takes years, you need the right people to teach the right methods and right stuff.
NA nowadays is better but the next crop of talent (aka current up comers and players coming up in the next years) will still suffer from their worst prep when faced with CIS/EU.
Lets hope daps/ES helps in that regard, but I have my doubts it will bridge the know-how/experience/development done in regions like Brazil, EU and CIS
Time will tell