#also mindset has been one of my fandom usernames since 1996 for a *reason* lol

[nobodysuspectsthebutterfly]

It's an interesting question, but tbf this argument applies to any question of monarchial legitimacy in ASOIAF. Not just Aegon and the Blackfyres, but also Jon and Dany. Stannis and Renly, Joffrey and Tommen and Myrcella. (Especially them!) Sansa and Bran and Jon and the Robb's will problem re the seat of House Stark. The whole damn Blacks vs Greens question that they literally made a tv show about, and you can see thousands of people arguing over on twitter and tumblr and reddit every damn day now.

Maybe it's getting too obsessed with a work of fiction, but I'd say it's a strength of GRRM's writing that we get drawn into these in-world political arguments, and argue using the in-world laws and customs rather than our own democratic principles and social liberalism. I have the occasional post where I note that all these arguments are truly self-deluding (always) patriarchal (almost always) classist (always and forever) nonsense, but I've also been known to engage in a bit of headache-inducing succession debate as well.

Though let's be real, a good amount of these arguments by fans are not simply academic debate, but biased out of love or hate for the characters. Or as one of my favorite posts of all time said,

my favorite thing about the "is Aegon VI a Blackfyre" argument is how it seems to really draw people into the mindset of being in the story, amidst the feudal logic.

outside of the "Varys needs a logical motivation" argument, there's plenty of discussions that range into the realm of... actual legitimacy. Are we really debating whether or not a Blackfyre is legitimate? Why do you care? Have we accidentally bought into primogeniture and monarchism, for a moment?