Since the Fall season of anime, I have been editing fansubs. I am frequently asked if it helps me learn Japanese, or more about the culture, or more about anime in general.
The fact is, no, it doesn’t help with Japanese anymore than just watching anime would (which is to say, like an anime character, full force, etc). However, it has actually taught me more about the English language, and how native speakers really struggle with English in general. It’s extremely depressing that in this country, states can just make up whatever shit they want to teach students in their public schools. Naturally this means that unless you live in a state where opening your mouth to speak is actually beneficial (read: surprisingly not very many), children do not learn much of anything about the language they are expected to write, speak, and think in.
More to the point, English is a malleable, evolving language. When people fuck something up enough, the language changes to accommodate. At the same time though, there are still rules in place, and not being able to understand certain aspects of these rules is foolish when they are very easy to master.
Also, because of how egotistical we have become as a society, we naturally think that every time someone tells us that we are wrong, we tell them that they are full of shit. We never consider for even the slightest moment that the way we learned something was invalid or incorrect or archaic. “Well my mommy and daddy said that you’re supposed to say “on accident” instead of “by accident,” so it must be right.”