admittedly in the case of roxy, roxy was *the* most poular trans girl headcanon in the fandom prior to the release of the epilogues (like it wasn't close if someone had heard of a trans girl headcanon for homestuck it was probably roxy) so there is more of a legitimate disappointment response about them being made transmasc in post canon to contend with there, but I do feel people who felt that disappointment have (largely) accepted and/or gotten over it from what I've seen

but yeah its an unfortunately ingrained staple of a lot of fandoms to act like an injustice is being done when a character transitions after being introduced (or is trans at all).