Which... could work, except a lot of people seem to put that forth as what makes halflings the best and most good race. They lack ambition to do anything more than exist as they do.
One can criticize Halfling with the fact that their lack of ambition and ease of comfort allows evil to flourish as Halflings as a whole put little effort in keeping the peace and doing good outside of doomsday scenarios.
Sure they'll help stop the Dark Lord at the end. However when the Dark Lord is carving out his based and committing atrocities, the Halflings are doing nothing to take out his minions.
Hell it was Gandalf who put the hobbits on their quests. They just didn't go and join on their own.