The dream of Mythic is basically dead... Frost Interview with Yoshida

[Dracian]

....

A couple of things happened that led to what you are referring to. The first is that class rotations become longer and more complex with each subsequent expansion. But, in order to minimize the amount of buttons we have to manage on our hotbars, stuff got cut, and most of that was crowd control and situational abilities (such as Quelling Strikes). What was left was basically spread across entire roles, so that you didn't have to try and hunt for a specific job to do something. That's the overarching problem. They can't give us anything more complex than wall-to-wall trash pulls, because we don't have the tools to manage those.

The second was that the developers really wanted to streamline the dungeon experience to be no more than around a 15 minute chunk of content. Gone are the branching pathways of Toto-rak, or anything beyond hallways and trash packs. I'd love to see this be better balanced, but I doubt it.