You have to remember that Coil was their endgame "finale" content so naturally were going backwards a bit whenever new stuff comes out. It's just them filling in the gaps. To most of those whom are i90, it might not even be much of a challenge, but it's to be expected. They released coil first which was a bad idea, but at least the journey to coil for new folks won't feel so steep with all these new dungeons coming out.