Well,
I am all for people killing and exping in zones that have the right toughness for their level.
So, if you are fleeing and dying a lot, i think you should exp in safer zones.
How else do we regulate the speed with which people go up in level?
I could reduce the exp you gain from mobs, and increase the time between attacks in fights, that would increase the time it takes to level up.
Or, we put the onus on the player and make the punishment for dying and fleeing high, and then it is up to the player to avoid zones that are uneconomic for them to play in at their current strength.