I think the lack of fletching in the base game is an obvious oversight, similar to the lack of dragonbone weapons. Not necessarily needed, but they should have been included. Before Dawnguard, using console commands was the only possible way to get Nord Hero Arrows, since stores don't sell them and you couldn't make them. Personally, I feel including these things in the DLC vs in patches seems a little cheeky, considering I do feel they should have been in the base game, but I can't hold it against Bethesda that much.
