If you'll all remember back before the fletching revamp, rangers always carried around a fletching kit and 4 stacks of components for Silver Steel Bodkin Arrows so that we could fletch arrows on the fly in case we ran out.
When Tao revamped fletching, it include a DPS upgrade - we still had 8 base damage arrows, but the possibility of bane damage could increase our DPS significantly. Quivers had 50 charges, which gave us more available stacks of arrows to use before we had to hit the fletching vendor again. It also cost less to fletch a whole quiver than it used to cost to make a raid's worth of Silver Steel Bodkins. All-in-all, Tao's revamp was great, and the ranger's existence improved considerably.
The summoned arrows on the CoD sword give rangers a taste of greater freedom from consumable ammo, yet the limitation of 20 of these arrows means that rangers must continue relying on all of the same quivers we had before, plus the addition of this item, in order to do our best, most reliable DPS. Basically, instead of moving rangers towards greater freedom from consumable ammunition, this item makes things more complicated.
A number of decent solutions have been proposed in this thread. I hope Tao and Marza can come to some sort of agreement which will allow the ranger CoD item to function in a way that doesn't further complicate a ranger's management of his ammunition.