I find it quite pointless. Many times you are in the raid group waiting to get it loaded and you could easily do 4 or 6 daily quests meanwhile.
All this years and I stil ldon't understand why the restriction is still there. I could understand it in Vanilla, so people would't raid Argent Down reputation maybe... but now?
Just as they removed the raid group to enter old raids, they should remove the restriction to do quests.
What do you think? Maybe we should start spamming the forums and see if they do something about it.