I don't like it.
I would love an expanded diplomatic module, but not if it's just "protocol" (and besides having to pay for it
)
Diplomacy is, firstly, protocol, other - secondary.
In my mind, all should be beautirful and in harmony.

So, the pretty trifles like this (or for example - medals) in game mechanic like this (imortant: drived by players) can fill the game its own atmosphere, spirit and make it more cozy for players.