I think she was included to mock the notion of aristocratic bloodlines. Arranged (forced) marriages between royal families were always for the purpose of procreation and, well…
But yeah, you need so much setup and context and certainty around the bona fides of the OP that the punchline itself (if I’m even right about the intended punchline) just gets suffocated.
There’s only one guaranteed way this joke would land and that’s if Vivian herself had posted it.
I feel there’s a similar relation between Mac :: Ubuntu (me) :: Arch.
I try to explain to folks that I have very little interest in anything outside of /home. I truly use Ubuntu because I like the desktop and Steam works and I have all the dev tools I need. But a certain type of otherwise competent Mac-using developer thinks I must be a 1337 h4x0r to even dare to use Linux for actual work.