Exactly. Honestly, if you look at most of the appreciation threads on this site, many fan bases have similar divides. And just because this is a pet peeve of mine (not trying to single anyone out), but if someone says they are a fan of a character... they are a fan of a character. Not sure there is more to it than that. Now we might like different versions or aspects of said character, but that doesn't make some "better" fans than others.
Also, maybe I'm in the minority on this, but I never had the feeling that Rogue and Gambit still having feelings for each other was completely out of left field. I mean, there have been multiple hints to it throughout various books over the years (i.e. Gambit's solo, UA). Astonishing was just the first ongoing that featured both of them, so there was more time for interactions between the two (just to be clear, I didn't love their characterizations in this book either. Just trying to make a point). It's not like Gambit was in another relationship and then suddenly had feelings for Rogue again. It wasn't that jarring for me, and I think KT did a good job of explaining this with the flashbacks.