Whoever is trying to rationalise level caps - you're fighting a losing battle.
This is an online game that the higher you get, the more ridiculously hard and gruelling it is to level. Why make a cap?
Saying there should be a cap is basically saying that you can't be arsed to level, but you don't want to fall behind because of it.
Personally once I got to lvl 43 in Ace M2 I couldn't be bothered to level anymore and just went to bosses, but to ask for a cap for others so I couldn't fall too far behind is completely ridiculous.
People choose to play how they want to. Some people don't want to kill bosses and want to grind, some want to PK, some want to kill bosses, some want to solo level, some want to group hunt; thats the beauty of this game and the reason people remain to play it.
Seriously, if you want a level cap, go and buy Pokemon.
This is a stupid a$$ thread and it should be closed.
EDIT: After re-reading the post I must reiterate that this is a stupid and useless idea. If I had time I would go through the points one by one but literally every argument FOR the cap is baseless. **** you all for wasting my time