Talk about handbags at 5 paces!!
Fact is there are fundamental differences between ALL ATC units/airports/nations/centres etc.
The purpose of ICAO procedures is to ensure that all pilots and all ATC officers are singing from the same songsheet, irrespective of the geographic location they occupy. It is clear that ICao is currently failing in this regard.
In terms of the USA there are airports who perform better on a day to day basis than others, this is often due to runway layout, sometimes apparently due to better training and more professional approach, often due to traffic levels and often due to proximity to other busy airfields.
However, I feel the main problems with ALL uS airfields are the systems and procedures in place. By this I mean such things as conditional clearances ie. you are 4th on the approach but are still given landing clearance, no problem on a gin clear day but a real problem on a gin clear night!
Atlanta 8th November 1994, night, good vis a B727 landed on top of a Beechcraft which was slow clearing the runway (perhaps he didn't bring his "A" game!). The B727 had been cleared to land but could not see the Beech in the lights of the runway, deaths on the Beech resulted. That person died not because of any particular human failing but because of the procedure!
Airports like BOS with cross runways are also a danger, there are many of these in the US. (SFO, ORD, JFK, MIA to name but a few, very busy ones). The way to make these place safer is to put in place safer procedures, not more dangerous ones like LAHSO!
The failure at BOS, whilst a human failing also highlights what is a very dangerous system of ATC operation. Things DO need to change in the US, for the benefit of ALL aviators and passengers who are at the mercy of some dubious practices