In addition to the denial-of-move action and combat advantage benefits, it's fun.
It also seems as though it would be a natural consequence of slamming into people or launching forceful attacks against them, and it's somewhat cinematic in terms of visuals. More so than merely standing around hitting someone with a metal stick. Daze someone, and what happened could be left up to interpretation. It's certainly up to the description or flavor text one provides. Knock someone on their... back... and the effect is a very clear, easy, and dramatic visual.
If a party has a rogue, the controllers, defenders, and even leaders should have "give the rogue combat advantage" on their list of priorities somewhere. If such things are simply left to the rogue himself, he's going to have a much harder time and potentially waste actions and turns to get the advantage... turns where an enemy is still able to cause your party damage.
It also seems as though it would be a natural consequence of slamming into people or launching forceful attacks against them, and it's somewhat cinematic in terms of visuals. More so than merely standing around hitting someone with a metal stick. Daze someone, and what happened could be left up to interpretation. It's certainly up to the description or flavor text one provides. Knock someone on their... back... and the effect is a very clear, easy, and dramatic visual.
If a party has a rogue, the controllers, defenders, and even leaders should have "give the rogue combat advantage" on their list of priorities somewhere. If such things are simply left to the rogue himself, he's going to have a much harder time and potentially waste actions and turns to get the advantage... turns where an enemy is still able to cause your party damage.