ummm you would have the opportunity to solo ONE job ONE time to 40 via an in-depth story or series of quests. You could then choose to play the MMO version of the game (which doesnt imbalance the game since you could have just solod in the normal mmo world at the exact same speed).
DoH and DoL are meaningless for solo since you can get all gear from killing low level nms and leves and since solo in the game is so easy. I mean i can take out mobs 10 leves above me naked and with a weapon 10 levels below me and never even get close to death.
DoH and DoL are only useful for endgame now....