I suppose one of the benefits of having been fannish in the 90s is that what a creator thinks of your interpretations and ships is essentially irrelevant to you. As long as they’re not sending you cease and desist letters, it hardly matters if a writer thinks your ship is ridiculous/gross/offensive/wrong. The author, while very much alive, is dead. Obviously we can (and do!) still love them and enjoy hearing what they have to say, but when it comes to how you ship and what you see inside their story, their voice and their power is limited to the narrative. And even then: if we don’t like what the narrative says, we can, and will, fix it.
I think it’s a sign of social progress that slash shippers get to behave and feel the way het shippers did in the 90s; entitled to the ending they want to see, confident that canon will reflect fanon, perfectly happy to lay their interpretation against any other in broad daylight. That’s good progress, and I think we should celebrate it.
There will always be ships and scenarios that seem canon-inconcievable to most, and that’s as it should be. “What if” has always been an important question in fandom. Everyone’s got different “what ifs” in their heads, and everyone’s got different answers to them. That’s the wonderful diversity that fandom brings. The challenge of finding a way to link up two characters the original narrative has no interest in pairing is an intriguing one to many. Pursuing that challenge is something else worth celebrating!
In the end, the stories in our heads, no matter who put the seed in there, are ours, and we can manipulate them any way we like. No matter what anyone else, powers that be included, think about it.