No American bashing please. Here is an explanation: FAA ATC procedures in the U.S. do not require reback of clearances if the clearance is acknowledged by "roger." (Yes, there are exceptions).
It is hard to break this habit. Is this right? No it is not, but this is the reason.
I currently train American pilots new to Europe, and I am constantly beating on them to repeat back ALL clearances. Human nature, it is hard to break old habits.
Also, accents cause problems, and intersections (points) many times are difficult to understand. When controllers spontaneously spell some intersections phonetically, without a request, this helps, and shows professionalism on the ATCO's part. Yes, this is not always possible, but when it occurs, thank you.
I have heard the same situation occur in the U.S. with non-U.S. pilots flying over America. It works both ways.
