You'll find that in any system where people communicate, a "slang" or abbreviated style develops.
I flew an airplane for many years and instead of referring every x'mission to "Charly Golf Golf Delta Uniform" I only used it in the initial contact with local
ATC and later on this became "Delta Uniform" in further x'missions with the same terminal operator. Professionals in the Air Force, where I spent some time also developed a shorthand "slang" ,which we all understood.
In International traffic understandable language, of course, becomes more critical and we should use clear and concise English language and terminology. That at least is common curtsey and mostly enables a pilot who has only learned standard phrases in the English language a fighting chance to understand the instruction correctly (particularly on VHF !). To insist on using one language in all air communications everywhere in the world seems to run into political problems of nationalism etc and cannot be expected to be resolved any time soon and leaves the door open to misunderstandings about traffic situations in the air and on the ground
