Please elaborate, I had no idea what histories these studios have, and if you what you say is true that does explain why fans overhype the shit out of anything they do.
Studio Gainax are the anime studio who made, among other shows: Daicon IV, Gunbuster, Otaku no Video, Nadia: Secret of Blue Water,
Evangelion,
FLCL, Gurren Lagann, and Panty & Stocking. Those three I bolded are among the most popular anime in history and are used to this day to onboard people into the medium, and the staff that worked on all these shows are revered as Great Men whose presence on another show's staff is nearly guaranteed to make casual and hardcore anime fans put those shows on their seasonal watchlists.
Gurren Lagann is the big thing to highlight with my post. When the show started airing on TV, lots of Japanese anime fans (posting from 2ch, the Japanese website that 4chan is modeled after) were bombarding it with criticism from the start thanks to its more simplistic designs and shading compared to the rest of what was coming out.
Then GL's fourth episode brought those criticisms to a frothing rage, as it was an entire episode animated with extremely unique and VERY off-model drawings and characters, with an extremely noticable and low-effort shot directing style to boot, all attributed to the episode director
Osamu Kobayashi. The backlash to the episode provoked one of the original founders of Gainax, Takami Akai - the guy who signed off on the decisions to go with this loose, nearly-anything-goes approach to the show's artstyle that FLCL once used to immense critical success - to publicly complain that reading all the angry 2ch comments towards the show's animation was "like putting my face next to an anus and breathing deeply".
Of course, insulting your viewerbase is an act of career suicide that can take your whole company down with you, so Akai was immediately let go of Gainax once those comments became news - only five episodes into what ended up being a 27-episode TV show.
What I'm saying is that bringing back Kobayashi to do an episode of Panty & Stocking that was made unmistakably different from the rest of the show was an act of blatant spite to the audience and an attempt by Gainax to make amends to the director.