Japan will NEVER win the World Cup through teamwork alone. They simply can't match Europe's top nations player for player.
That's exactly the problem Blue Lock is trying to solve. Even Itoshi Sae says Japan is weak, and he plays for Real Madrid, he knows the gap better than anyone.
Ego Jinpachi's philosophy exists because Japan needs egoists, players who can create the unexpected and decide games on their own.
So whether Blue Lock is "realistic" misses the point. It's exploring a solution to a real problem within Japans national team, and that's what makes it so interesting.
You also proved you don't watch football if you think selfishness is a bad trait. Messi, Cristiano, Mbappé, and Neymar were all "egoists" at 18 years old. They wanted to score, dribble everyone, and be the difference. Teamwork becomes more important as players mature.
It's unbelievable how many people talk about football without actually watching it.