>>896594dunno maybe they saw OkaKoro working out really well, tried the concept with Gen3 which also was a huge success and continue from there.
Also notice the difference to Gen 2 and Gen 1, most of the really secluded autists are in those, the exceptions being Fubuki and Subaru, really.
Japanese never become adults, really.
Their university degree is very basic since they learn the real work-related stuff only at work anyways, so basically it's more high school. That's why they work best with clear senpai/kouhai distinctions as kind of a basic guideline how to interact with one another.