Perhaps Capt. Emad misunderstood my comment about those who do not have English as the native language. The rapid fire instructions from the New York Controllers or in particular the ATC at Chicago is conveyed at a speed that may even perplex a British pilot.
If the culture of the Korean people is to defer to those in authority, or regret to admit you didn't understand or dare to question the instruction given by ATC, it may be hard to come back with "Say Again ...." or "Unable". Thereby electing to continue on a very uncomfortable descent profile rather than complain.
Thank you, heavy heavy, I think you understood exactly! I would rather fly in your 747 any day.