yeah that usually happens in mangas
cause until the end, people delusionally hold on like "the rest of the konoha 11 is totally gonna get development in the 4th war" "sakura is totally gonna catch up to naruto and sasuke" "madara is the final villain" etc etc
And once the series finishes, there's no more copium. just the reality of the series which is trash. garbage. there's no more "it's all gonna be relevant and come full circle bro".