Liquid Flame is an example of how overly easy things are.

[Exiled_Tonberry]

.

How about this then. Make the story dungeons easy, and the optional dungeons a bit more difficult.
Say, if Xelphatol is 210ilv, then Gubal would be 230ilv. Most people playing casually can reach that and it would allow for a more challenging and fun experience.

Sometimes I like to feel like a healer in dungeons, not a DPS that occasionally heals every 40 seconds or so.