Ok Warlock back to the topic, are you saying that a New York ATC'er is happy to work without any callsigns in readbacks. Are you saying they rely on their voice recognition skills instead? Because you are saying that Aussies are pedantic for needing readbacks as specified in all documents, and that we wouldn't be able to work in the US for that reason. Is that what you are saying?
BTW before you play your little violin to yourself about having to talk to more than one controller at a time, with 2 guys up the front to do it. Spare a thought for the one guy trying to talk to 20 aircraft at the same time, with noone beside them doing the Sudoku, who they can ask to make that call for them.
Your posts really stink of someone who has never stepped foot inside an ATC centre and so has no appreciation of the challenges that are faced everyday on the other end of the radio.
Not trying to be anal but 3 easy rules to follow,
1. Use callsign always.
2. Meet any restrictions as outlined verbally or in documents unless otherwise cancelled by ATC.
3. Say your level passing and cleared level on first contact.
Easy really isn't it.