There is at least one dungeon with a puzzle that no one does. Usually because tanks role play as flash in this game and the rewards for doing the puzzle are lacking.

As for dungeons. The reason they are a joke, is that the maximum item level is too high for the dungeon. A balanced dungeon would require a party to safely handle one group. Has difficulty on handling two groups at a time. And 3 groups would be certain death. Removing the role playing as flash from the equation.

The fix could be as simple as a setting "Force minimum item level while giving rewards based on character level" on duty finder.

So if you enter a level 20 dungeon with a character that is level 80. You enter as if you got the lowest item level for the dungeon. And in exchange you get rewards for a level 80 character instead of rewards for a level 20 character. That of course would require individualized chests. Some people will do it. Some will turn the setting off and keep role playing as flash. But the choice would be there.