This reminds me of a quip relating to evaluating the morality of historical figures (e.g. whether they were basically good or basically bad) - you're a tourist. You're evaluating someone in an entirely different culture.
So like you said - same thing with languages. You could probably substitute "Japanese text" or "Arabic text" into the original comment and see a little more clearly that fluency does matter.
So like you said - same thing with languages. You could probably substitute "Japanese text" or "Arabic text" into the original comment and see a little more clearly that fluency does matter.