For what it's worth, leveling experience is absolutely atrocious for a new player.
They did an effort to make it slightly better with Exile's Reach, but once that done - there is a void of crap between that and getting to latest expansion content.
IMO, they should think about some sort of evergreen follow up to Exile's Reach that gives players a coherent experience story-wise and system-wise. Some kind of future proof story at least for the few expansions that's on one hand offers a complete on the rails experience and on the other hand introduces new players to the world and how the game plays beyond first few levels.