also winning u20/17 the same thing , that doesn't mean they all gonna translate that to high level football if not Nigeria Argentina etc would have a few world cups.
it's good that they get used to winning at an early age but the job of these levels is to "create" players for the actual real deal high level football. at under 20/17 physicalaty between some players is HUGE because they still kids growing into a mans body. in the top level only a handful of players beast physically over their professional peers plus the tactical and experience level of playing against 30 year old man is much different than playing against a young 19 year old who has speed but nothing else
it's good that they get used to winning at an early age but the job of these levels is to "create" players for the actual real deal high level football. at under 20/17 physicalaty between some players is HUGE because they still kids growing into a mans body. in the top level only a handful of players beast physically over their professional peers plus the tactical and experience level of playing against 30 year old man is much different than playing against a young 19 year old who has speed but nothing else