A few reasons I still use aluminum.

1. I still like to keep the weight of the arrow at 9 or 10 grains per pound pulled. Just more accurate for me.

2. I like to use heavy broadheads (150-190 grain), about the only arrow that I have found to work very well with the setup are 2419's or 2613's. FOC is right around 14%. Again, more accurate for me.

3. I like to be able to get four helical fletchings on the shaft to stablize broadhead flight

4. More KE downrange

5. I like to be able to pull arrows out of my 3-d targets

From my experience, I just have not found any carbons to fly very well with my fixed bladed cut on contact broadheads.