[binary_slinger]

> 2. More importantly, the pilots and ATC folks speak excessively quickly and do not enunciate at all.

Multiple aircraft’s one frequency. Need to speak short to allow other potentially higher priority calls. Also take a moment to read: https://www.faa.gov/air_traffic/publications/atpubs/fs_html/...

Of course in practice there are deviation's from the phraseology.

I do agree the DC ATC audio is very poor. Not all ATC communication is that poor. And often it is quite clear especially once you get use to how radio calls are made.