Director Osamu Dezaki started a revolution at Tokyo Movie in the 70s, according to this 1997 interview on The Adventures of Gamba.
"Yes. I distinctly remembering meeting with (Isao) Takahata several times in Sakuragaoka. We’d have two hour meetings just to talk about 30 shots."
"I barely got published in two [gekiga] magazine volumes. I have those volumes stored away. No one has seen them. (Osamu) Dezaki was under the impression that none of my submissions got picked up for publication, but I proudly informed him otherwise."