Why the Fionna and Cake episode was so popular!

OK it has been raised to my attention that once again the loud majority of the minority have screamed for the rooftops that "The Fionna and Cake episode was so popular because it was so well written showed two strong women in an Adventure situation"
Now for my most popular catchphrase to date!
I
Call
Bullshit
And here is why:
First of all, it was not especially well written, the plot twist was more of a corridor that telegraphed the answer right at the beginning like an obnoxious movie watcher with tourettes, it got a C on my scale of regularity, the scale goes from C to C, because it it regular.
Now the girls were not in an adventure situation either, it was mild adventure with the rest of the episode full of Fionna going lovey dovey over the prince, the fandom is quick to dismiss the rest of the episodes for being misogynistic and male orientated yet fail to notice this one. Biased much???? 
A character wo spends the most half of an episode following a love interest like an obedient puppy does not come across as amazingly strong, even Cake spends her parts in the show trying to hook up with Lord Monochromicorn.

The Fionna and Cake episode came around the middle of the third series, way after the fandom had got started and all of the regular things that come with mass fandom was already underway, fan art, relationship pairings, fan-fic, genderbending!!!
Did I just blow your mind, cause I think I just fucking did, I saw genderbending fan-fic way before the episode came out, it was nothing new by then.
So imagine this, an entire community of fan artists carrying out their regular duties behind the scenes due to it being often viewed as dirty and perverse by others, and suddenly, their chosen fandom releases an episode where the characters had been genderbended, something they had been doing for months already!
Suddenly this was big, the fandom screams out in glory because it's official, the creators of the show support our fandom. This one episode qualifies months of work that can now come out from behind the scenes and be flaunted for all to see.
Now we can take it one step further and see that the show was based on an idea by Natasha Allegri, an avid fan-fic'er (fan-fictioner?) nce you see that you can notice IT'S ONE GIANT FAN-FICTION. And what to fandom respond to the most?
MORE FAN-FICTION

That is the reason it's popular and that is why I am now receding into witness protection.