I agree, but it seems that a quest is always tied to a cave and becomes extremely repetitive in that way and just seems to be filler.
I can't swear to it, because I'm not really playing the game with a critical eye, but I think you may be guilty of a little hyperbole here. It seems to me I've played scores of non cave quests.
However there's still too many cave quests for me regardless as I fricken don't love caves as my previous rant a few posts up probably illustrates.

