Molten Furnace, Aquatic; two fractals sharing a similarity in how mind numbingly boring they were. I've had days where I struggled to stay awake in Molten Furnace, so when I saw those changes I liked them. In fact, any change made to increase the difficulty of a fractal these days is something I'm positively receptive towards - I still disagree with having made Twilight Oasis easier with albeit limited phase checkpoints. What was done to Aquatic however wasn't in my opinion an improvement. Mechanically, it seems like a monstrosity from the Siren's Reef department of 'throw-everything-at-you-and-see-who-breaks' design. For the record, I like Siren's Reef and I look quite heavily down upon people who use the exploit, if it still even works. Aquatic wasn't boring because it had a boss that wasn't fun nor a pretext to said fight which barely required consciousness. That's the way of every single fractal when you've done it enough times after all, and I'm still entertained doing any others as dailies. It's boring because it's guilty of being underwater content, an aspect of the game I'm certain a majority of people at minimum don't care about/actively dislike. Personally, when I see water past wading-depth in GW2 I avoid it like a fresh outbreak of Bubonic Plague in 1348. I somehow doubt that sentiment is less than uncommon in varying degrees of severity.
It doesn't matter what you do to mechanically alter the Jellyfish, or what additions you put in front of it. They don't improve the fractal as a piece of content, all it does is elongate something which you already didn't want to spend time on and frustrate through the new boss phases. Every issue Aquatic had was merely a symptom of it being underwater content, not a flaw in any individual component of the fractal itself. Replacing the Jellyfish with a three-phased fight which stacks radial condi damage on you you can do nothing to avoid (there is a difference between 'avoid' and 'mitigate') doesn't resolve the core problem of underwater content, making the boss ruthlessly punish melee to the point of uselessness isn't an improvement and removing all CC bars from sight doesn't fix anything. This just feels like change for the sake of change and I hope it isn't a wide brush that's going to start tarring all the other fractals. Aquatic doesn't suddenly require more skill and it hasn't been made harder as a fractal - it's still the same boring, slot-stealing fractal it always was, just longer than ever.
I know the change won't be magically reversed and my opinion will doubtlessly never be taken into account by anyone of relevance, but the sheer lack of necessity in this change was a frustration I had to be annoyed somewhere about. It didn't even have remotely bad instabilities today, when it finally rolls any mixture of frailty/we bleed fire/boon overload/sugar rush it's going to become downright painful on top of needlessly drawn out.