My question is: Which are the social differences which lead to the variance in the way to address a person?
An example of the difference is T-V distinction some languages abolished it while others acquired it.
Greek acquired it 2 and a half centuries ago. English forsook it in Medieval times or even before.
An other example is the Title.
Greek uses Master(Κύριος) and it commonly means both Master of a house and Mister X.
English altered Master and turned it to Mister so as to address people.
Sir, Herr and the Latin words derived from Senior (Senhor, Signore all derive from Senex which means elder.
The words derived from Dominus are not used in that way (usually).
My question Why the discrepancy? What were the differences in society that lead to these differences in languages?