Almost as if once you mastered both your class and the encounter the content that run over and over again becomes trivially easy. Just like with everything in real life.

People like to point of Ivalice or Dun Scaith for being good examples for mid-core content and while TRUE....As somebody whom ran those raids multiple times for glams, I'm going to straight up tell you, those raids are piss easy for me. Learning mechanics isnt hard when you repeat them over and over again when you memorize them. Even back when Dun Scaith gets circulated into Moogle Treasure Trove so people run those frequently, the fact that during that period where we have players freshen up on the mechs, the raid itself becomes trivial because everyone knows it.

I personally see the difficulty fine as it is. We have the Savages and EXs for people whom want that extra bit of challenge and we have the regular dungeon, trial content for the rest of the playerbase whom lets face it, is an MMO thats catered to the very casual audience. If people avoid wanting to be challenged or get better thats THEIR issue. No need to force it on to the entire playerbase.