This. TES just isn't that kind of game.
Besides radiant story should do a good job of giving us random 'daily' quests to do, they'll also be more varied and tailored towards your character than just 'kill X amount of creatures'.
What they said ^^. I understand that game companies take inspiration from other game companies games, but some things only work/don't work at all with some games, what would be the point in the challenges? To be rewarded bonus xp? Bad idea if youi ask me, you are just asking to get to the highest level in the shortest space of time, plus people boosted the challenges and disconnected their internet to be able to do the challenged over and over. With radiant story, there is no need for this kind of thing, even if there was no radiant story I still wouldn't want it.