There is really no point to this suggestion. All you are basically saying is that you want it to be easier. Easier means the loot is going to be less expensive, and since your suggestion involves making all dungeons easier, all legendary loot would becomes less expensive, meaning you would have to farm more to earn the same money. So in the end everything would be equal when it comes to PvE. You would clear mobs faster, finish dungeons faster, loot more legendary items, and they would all be worth less. And a most likely result of making rogues and mages more powerful would be that they would increase the difficulty of the dungeons to balance it out. So in the end you would be back where you started. I don't get the point of that.