If you are just asking about world already built, this site is not suitable. https://scifi.stackexchange.com/ or https://movies.stackexchange.com/ would probably be a better fit.
If there is some element you want to implement in your world, it is OK to ask about it, provided that:
- Question will contain all the data needed and
- Question will contain all constrains you want
It is not acceptable to ask question in a way that only fans of certain anime / tv show / book series would understand, and it is not acceptable to dismiss an answer only because show did it differently, when such restriction was not present in the question itself.
As for "questioning why certain types of worlds tend to have the same approach to something" - it is not acceptable, at least not when stated this way. We cannot know what all these authors were thinking so this could be closed as primarily opinion based. There is no actual problem to be solved, as noted in help center, and since it is not about building a new world, it is simply off topic. If you are building a new fictional world, and want to know if such elements makes sense given your constrains, OK, question about that may be all right.