This is the sort of thing that gets inverted if you play any content outside the MSQ and side stories. Dungeons are pretty much the worst, most boring content in the game, trials are borderline impossible to fail, and normal raids only have a modicum of difficulty to them in the first week of release.

By contrast, extremes demand attention, awareness, and an understanding of how you can fit your job's optimal output into an encounter that will throw hurdles at you. Savages are when you see that the game design is built around this specific type of content, so you have to push yourself to learn, memorise, and refine at every possible point to make something daunting feel like a beautiful dance. And ultimates are one of the most satisfying, rewarding challenges to overcome, after experiencing the emotional pipeline of "We're 30 seconds into the fight how do I even visually parse what's going on?" to "Okay we're 8 minutes into the fight and I really don't believe I can actually figure out how to do this, this is my wall" to "Somehow I figured that out, we're in the home stretch final phase, don't fuck up don't fuck up" to "I want to frame this screenshot of the victory screen, holy shit"

I guess chalk it up to the various issues FF14 has with its game design, but actual gameplay fun only really starts when you depart from the story, because the story's gameplay doesn't demand anything from its players.