DiabloFans

You don't but for your inventory it only takes up one slot as oppose to both. you wold equip the arrow/quiver in the other slot. It doesnt change how you actually shoot the bow, just allows a second slot for more customization.

What you are leaving out though is the subtle customization that having split stats can add.

Lets say I have a 2h bow
+5 dmg
+10 hp
+5 cold dmg
+4 dex

but instead i could have a 1h bow
+5 dmg
+10 hp

and choose from
arrow1
+5 cold dmg
+4 dex

arrow 2
+4 defense
+5% chance to crit

arrow 3
+5 fire dmg
+5% mana

arrow 4
+5 lightening dmg
+4% MF

or what if I get an awesome bow but it is only missing cold damage to help me freeze targets. I can supplement this problem by finding cold arrows.

Diablo is all about the gear and loot and adding variety to these drops could never hurt this game. Plus it gives people the opportunity to customize their character since we cant with stats.

and also

Also refers to the 2h weapon argument. There is no point in making a 2h sword 2 items, one is the handle the other is the iron part. WTF?

bows are made up of two components.

Yeah, arrow quantity would suck. For how fast paced they want to keep the action, going to town to buy arrows would stop that. I cannot think of any reason to add arrow quantity into D3.