The comment was mostly a troll, but meh...
PWI set the need for HK when they provided the ability to reach a level of 165 withut providing the means of getting the experience you need for it. OK, it is a nice high level cap, but where do you find mobs with a level of 175 providing the level of experience necessary for reasonable level progression? The fix for that is creating those grinding spots with mobs that provide the right levels of experience. If you are at 115 +12, you really don't get much exp killing mobs with a level of 120. All you have not is HKs and PKing those running HKs who are near your level (which provides 10x the experience to killing mobs).
The main problem is that players can venge repeatedly simply by recharging their vengeance. While it is a pretty good crone sink, it is interfering with the leveling means required by this game as it stands today (at least those that are getting killed repeatedly).
Simplest solution is to get rid of vengeance recharge altogether. Why is it even there? Somebody kills you, you venge and kill the original guy - or not. End of story. Recharging vengeance has been around a long time. Perhaps it is not more of a hindrance than an help. Perhaps I can throw it into the skunkworks project for discussion.