Don't worry, I'm OK with being wrong and I'm always up for learning! I was only talking of my perception of things, so yeah, if I'm wrong that's OK, too.
Science Saru's adaptation of Eizouken was actually a very interesting watch considering the production side of things. I know it's not a documentary but you get some idea of how things work and you get the feeling some of the situations presented definitely mirror some of the team's/creator's personal experiences.
About Attack on Titan, yeah, that's an infamous production exactly because of the example you mentioned. I remember reading about an episode having a thousand directors too, making the situation untenable in the long term. I think they "dropped" it because they weren't part of the production committee and so weren't getting their fair share of the money generated by the anime.
I'll definitely take the Twitter handles of some of those folks, if they're industry people with public accounts, if you don't mind! The only reason I go on Twitter is that AiR account that breaks anime news and the sakuga gifs account, so at least I would have something more substantial!