So what is BOYHOOD? It's a portrayal of the current disillusionment generation of America, one that further externalizes the statist nature of the government and the non-progressiveness of the culture that resides around it.
It's fascinating how you tend to view a film as some parallel thematic connection. It's as if you prefer the subtext to the text.
Along those lines, I haven't seen The Tale of Princess Kaguya yet, but isn't it also subtextually about disillusionment created by a non-progressive culture?