[joe_the_user]

"There are companies with heavy non-native English speaking populations, for whom it be a greater cognitive load to constrain themselves to prose, whereas they might be good at explaining things pictorially interpersed with terse text."

I don't think giving a full, narrative structured presentation beyond the capacity of a non-native speaker given effort. While certainly other communication-approaches exist in other cultures - as well as in our own, I don't think one can really say full narrative structure is Western specific.

Moreover, I'd say the intent of asking for a narrative argument is to require a significant cognitive load from anyone putting out an idea. You definitely don't get a "brainstorming" effect, where lots of idea appear at once, from requiring a full narrative description.

"Sometimes distillation and condensation can lead to more precise thinking too."

Indeed. But the principle is a well written long-form narrative consists of a sequence of precise, condensed statements and not merely blathering on.

It might seem unfair to ask non-native speaker to reach a level of long and precise utterances. But currently, American education is poor enough that writing a coherent narrative document would be quite hard for a fair portion of Americans.