there is a bit of common misconception being spread here. Hussie has never commented on whether classes 'really are' gendered, or if Calliope was right or wrong about the subject. all Hussie HAS said, to my understanding, is that it is "possible to make a female character a prince". (http://web.archive.org/web/20160224200223/https:/twitter.com/andrewhussie/status/454750351334584320)

these are two very different things! whether it's "possible" to "make a female character a prince" is a question about someone's original character, to which "sure" is very obviously the correct answer; but whether your original character can be a female prince is not the same question as whether prince is "exclUsively designated for male players" (p. 4564) in canon. because Homestuck's princes exist within a specific narrative context, and classes are roles designed for a specific narrative context! whether a character chooses to follow the role set out for them by their class or to rebel against it is up to the individual hero, but that's the role Sburb expects them to play out in its grand fairy tale. and the roles in fairy tales are startlingly gendered: Prince and Bard are male-skewed destroyer classes because the only fairy tale characters who are afforded the privilege of being destroyers tend to be men, and while anyone is free to write a fairy tale with a female destroyer in it, Homestuck is a very particular fairy tale written by Lord English - who just happens to love stories about male destroyers!