When people asked for more engaging dungeons, I don't think people just wanted harder bosses. This is a fault with the FFXIV devs, they only think about boss fights.

The trash pulls are still boring and that is the biggest problem, as it is the main way a dungeon can differentiate itself from a raid encounter. Even though the bosses are harder, you still don't need to know how to tank or heal. It's harder to do ARR dungeons as a support than in Dawntrail.

At the same time, Trusts are still stupidly punishing for some reason. You die once and it's a wipe, even though your "Healer" might still be alive. They let you use phoenix down in group content, which was a good change, but trusts are still hard for no reason. Why can't they be the story difficulty on the dungeons? That are nearly impossible to fail while roulette can be left harder.

Even though Dawntrail dungeons are more difficult than Endwalker, I still think they failed in how that difficulty was distributed.

Not to mention one reason why people might not want to do dungeons anymore is because the rewards are crap. Gear with terrible ILVLs (except for the times they happen to be old content bis like Ultimates). And to make matters worse, they are undyeable. I tried using gear from one of the recent dungeons lately in a glam set but gave up because I couldn't get colors to match.