Flying Guy,
While I agree overall, I'm not so sure about the "good morning".
I find I always need a fraction of a second - let's say the first two words or so - to "tune in" to a new voice, be it on R/T or even simply on the telephone, and the meaning of those first two words usually gets lost. If that's "good morning" it doesn't matter. If it's a callsign, it's more serious.
Maybe it's only me?