I'm addicted to the Ding, as I've mentioned before; I exist to level up. But sometimes I'll be slogging along, feeling like I'm not getting any more powerful at all. For example, at Level 5, it takes me 15 seconds to kill a Level 5 ROUS. At Level 10, it takes me the same amount of time to kill a Level 10 Ravenous Bugblatter Beast of Traal. My enemies increase in level right alongside me. Where's the feeling of accomplishment?
Sure, you could go backward and wipe out old, lower-level enemies with nary an eyeblink, but once you've moved on, why should you have to go back? I understand the need for higher-level enemies to act as goads, spurring the player on by promising enticing rewards once you've reached the same status they possess, but once you've reached it, how is it any different than bumping along at the same level you've always been? What's the solution?