I'd dare to say Gaol fights V25 are also some of the best (and most challenging too!) content FFXI ever saw in its entire history.
They did Gaol lazily by separating it from the huge WoE/Sheol zones and making them 1x entry fights that you needed points from an entirely separate KI farm to enter. It should have been a revamped WoE/Delve, with "Gaol" being the final boss area that unlocks when you complete a certain amount of objectives.
Alliance content navigating through either of the Sheols, and at the end, you needed enough "Izzat" to unlock the final boss. Then you fight the appropriate wave boss (Atonement 1 for Sheol A, Atonement 2 for Sheol B, and Atonement 3 for Sheol C). Delve II, but way harder. Could have even kept the no-sub and no-repeat jobs thing, if you wanted to.
They had a bunch of interesting elements that made for a big challenge (Bumba V25 is ***, throwing Unity stuff in there was weird too), but their decision to break it up into 4 separate wings, 3 that use the same daily KI and one that needs points from either of the first 3 made it more of a slog and felt like they implemented it lazy.
With all that being said, Gaol was the most fun and uniquely designed content I enjoyed in FFXI, right next to Salvage 1. Salvage II never felt anything close to the original IMO. But are there really any Sophomore events that actually feel just as good or better than the original?
Limbus 2 and 3 sucked
Odyssey (WoE/Delve 2/3/3) feels worse than WoE and is completely different than Delve in structure
Ambuscade is nothing like Legion
Salvage II is watered down version of I
Sortie is about equal to Vagary
HTBFs I suppose are equal to the original mission fights
Incursion -- idk wtf that's supposed to be, its an original event, was there ever a part2?
I can't think of a single instance where SE got it "Right" on the second or third iteration, Master Trials maybe? They've just run out of juice on the content front.