[Cthulhu_]

> If you understand English

See that's where your assumptions already fall apart; keep in mind a lot of developers do not have English as their first language, let alone the cultural differences and nuances if they seem to have a good grasp of the language. "Can you change this please?" can be seen as a friendly request by one, a helpful suggestion that can be ignored by someone else, or a passive-aggressive "You Have To Change This Or Else" reply by yet another. It's not as straightforward as you wish it was or as you experience it to be.

Besides, English is not even a good international language; it's three different languages in a trenchcoat.