They need to break their fear of putting anything remotely challenging in the open world. As things stand, you explore a capped zone and have mindless farms or party-required fates. There's very little to no in between.

This gets even worse as ilvl is boosted during an expansion. I'd rather see some areas that are dangerous to travel alone at launch of an expansion that gradually become challenging -- but not easy -- over time to solo.

This is on top of wanting more reasons to travel in the open world. Blue Mage could have been this, but powerleveling ruined that angle.