4.2 Careful Aim nerf

I guess CA is only going to affect damage done above 90% health? Why? It's not like hunter DPS was out of line or anything. Why did they feel that this nerf was needed?  And it shouldn't make much of a difference in PvP either. Opening burst is nice, but it's not what wins matches - being able to burst someone from 35% to zero is far more important than getting them from 100% to 80%. On the other hand, MMO champ says there are changes they probably couldn't get ahold of with datamining. Perhaps there's some other change to offset the CA nerf. Still: bleh.