Board Thread:Arrow discussions/@comment-1783334-20170516181147/@comment-24152851-20170721131244

And it only occurred in a crossover with Arrow's less sci-fi-y cousin shows. Even metahumans that show up on Arrow are really weak and nothing Team Arrow can't handle.

Because they keep everything grounded in Arrow, so lots of the more comic book elements all got normalized. Arrow does not like to delve with anything too fantastical.