So this guy had to cancel his prime membership because USPS delivers shit service in his area in Brooklyn ? I sympathize with his issue in general but this has nothing to do with Amazon prime.

I think in general, the moment you talk about NYC boroughs, logistics are a totally different ball game compared to say suburban New Jersey but I am not defending USPS with this though. All I am saying is that Amazon Prime already runs with very thin margins and adding the luxury of being able to select multiple mail carriers for a region is probably not viable for amazon. Just my 2 cents.