HDRW,
Don't be so quick to air your somewhat limited knowledge.
I haven't got time to give you a precise reference, but if you were to look up ICAO Annex X, Vol.2, you would find that what I said is exactly correct.
You may have given the definitions of the meanings of "over" and "(over and) out", as you understand them, but in the above Vol. 2 you will find the explanation and limitations of the use of the call sign to signify the end of a transmission. In voice working, it is assumed that it will be obvious from the context whether or not it is the end of a transmission with a reply expected, or the termination of the transmission.
As for PPL and a radio license, what you have described sound a bit like the old UK system, the level of knowledge at that level, to get a (usually to start) restricted radio license, restricted to VHF voice, was not great.
PS: I have just been reminded that the one place where "over", "out" and "over and out" is still used, from time to time, and the probably the last time I heard it used, was in US.