Right, you concede the point -- New Yorkers "'overemphasize' the 'aw' sound" -- meaning the sound exists, albeit in a more subtle way than hardcore New Yorkers would pronounce it. I can agree with you that a New York accent is ugly; that doesn't mean there is no difference in the proper pronunciation of the sounds.
And it's funny that a Bahston guy is criticizing east coast accents here.
Nobody said the sound doesn't exist. The sound exists, and it has its proper place, like when you see a baby kitten trying to walk across a freshly waxed linoleum floor. It does not belong anywhere in words like coffee, or dawn, or even Dawn, regardless of age, cuteness, or whether she's a freshly waxed kitten. And while you've repeatedly accused me of an inability to listen, I noticed you still think I'll defend the marblemouthed Bostonian accent. I have no interest in defending our accent, any more than our legendarily bad driving which is matched only by the manhattanite wannabe crowd that live and drive by the mantra that they are the most important person in the world at all times.
I'm just saying that there are some spectacularly bad things done to the English language by New Yorkers, and this aw sound is one of them.