Because a certification has to be fixed at a particular point in time. Korea's certification exams start with the 23 GoF patterns and go on to rote memorization of countless patterns and layered terminology.
The problem is that the way you learn for this certification is the old way, so someone who gets the certification ends up writing legacy code.
But if you always update the questions to the latest, then nobody can pass the certification. So, having seen how the certification system works in East Asia, I don't think it's all that good