No, I do not mean that it happened so long ago that it seems natural now. I mean that no one ever had to force it unnaturally, unless in the context of a larger and stricter school of etiquette such as the court of Louis XIV in France.
The meaning of the term RSVP was precise and encapsulated well before the word "RSVP" ever came into being. "Please Respond" is a common and well-understood expression for an invitation and RSVP is merely a shortcut and clever reference to specific school of French etiquette that used the phrase "respondez s'il vous plait."
In contrast, VSRE encompasses both a new form of etiquette and a new acronym that doesn't reference anything special.
The meaning of the term RSVP was precise and encapsulated well before the word "RSVP" ever came into being. "Please Respond" is a common and well-understood expression for an invitation and RSVP is merely a shortcut and clever reference to specific school of French etiquette that used the phrase "respondez s'il vous plait."
In contrast, VSRE encompasses both a new form of etiquette and a new acronym that doesn't reference anything special.