interesting.
I agree entirely about the shorthand way of describing extended chords, but that is pretty much the same and has just been added to the continental notation, ie the added7, 9, 11, 13 etc etc.
I think the major 7th is shorthand j in continental, but that is a pretty basic chord, I suppose.
But you could argue that the continentals started writing music down first, so it is us who should be calling Ab As!
I wouldn't like to have to re-learn everything at this stage though!