As long as the USA is part of ICAO, they should ADHERE to the STANDARD ICAO Phraseology or ask for OFFICIAL ICAO published amendments. Don't like it Yanks? Then get the hell out of ICAO.
I suggest you stay the hell out of America if you don't like talking on the radios here. Enjoy your travels in the rest of the world. Or, you might take a lesson from beardy.
I find ATC in the USA to be very professional, succinct and accurate. I understand them and I am aware of their notified differences from ICAO. I am in awe of their ability to speak an entirely different form of RT phraseology from most (not all) American pilots and not lose their cool. It amazing that two ends of the conversation can be talking different languages and yet understand each other!
The above considered, my experiences with ATC in the Laguardia/Newark/Kennedy madhouse were, to say the least, frequently challenging and I am a native speaker of American English. But rather than whinge about it, I did my very best to master and deal with it.
Why?
Well, I wasn't the only plane in the sky, and I know that the folks in ATC are busting their butts to do the best they can in very crowded airspace.
As to "say again:" it's in the phrase book for a reason. I used it when I need it, and I think we all have.