I don't see a need for rested xp at all. *shrugs* Played a few weeks and have a 50 and a 38 already and wasn't difficult at all. I don't think max level should take years to reach but a few weeks playing casually? I thought there would be some difficulty to it.
I hope if there is rested xp inc it is difficult to get. You should have to go out of your way to get it. Maybe they should put in a long quest-chain to unlock rested. Rested xp questline takes 2 months to finish.