Perform is a perfect example of poor appeasement. It's only intended for an incredibly niche audience, released in a patch where the entirety of its content was also niche. Casual players had one dungeon, Rabanastre and a beast tribe as content intended to last through the duration of 4.1. That is abysmal, hence why you saw frequent complaints of boredom. 4.3 offers similarly less, though at least Heaven on High attracts a far less niche audience. Unfortunately, it's more than a little lackluster before you reach the higher floors. A general content focus is fine, in theory, but Stormblood as a whole simply has very little to offer unless you like virtually everything. And if we go by the unofficial censuses,
the numbers demonstrate a clear lack of interest. Stormblood is seeing 3.1 levels of disinterest, which is staggering if one considers the state of the game back then. While these numbers are by no means definitive, it remains disconcerting all the same, especially as WoW enters is latest expansion. Meanwhile, FFXIV is likely to undergo a significant drought unless something surprising occurs in 4.5.
Contrary popular belief, Gordias Savage did not destroy the game, though it did severely impact the raid scene. Let's review what released between 3.0 to 3.2
Gordias
Thordan EX
Four dungeons
Void Ark
Lords of Verminion
Diadem
This spanned over
eight months, the longest delay between updates since FFXIV's relaunch. Both major content updates were essentially DoA, thus casual players had literally nothing new to keep themselves occupied. Meanwhile, the devs openly acknowledged they undertoned Void Ark and severely overtuned Goridas Savage. Bear in mind, unlike any other tier ever released, Gordias was gear locked, making it impossible to clear unless tome weapons were available. Even Ultimate didn't impose such a restriction. Had Gordias been properly tuned, it never would have been the monster it became. Furthermore, the game lacked key components which heavily impacted raid progression: cooldown resets and cross world PF. The former forced players to either pull with necessary abilities still on CD while the latter made recruitment pools swallow at best. Hence why Gilgamesh ballooned.
It's entirely disingenuous to fault Gordias for the destroy of 3.1.