Honestly has there been a difficult dungeon since Stormbloods launch?Because i dont think there has.Then again for those of us who have played the game longer than most its obviously going to feel this way.
For newer players they are likely more challenging.There's a reason why dungeons have a lower difficulty curve than 24 man raids,8 man raids and ex's.One is a completion requirement to progress.The other isnt.But if you feel you want a challenge then i suggest go equip lower ilvl gear on your left side and higher ilvl gear on right to gimp your stats and do it with a bunch of friends doing same thing.