Originally posted by Chaoslink:

The issue with aiming bows at least is the projectile fires from the tip of the bow, so it’ll go straight down, but not from where you’re expecting. You can easily adjust for this though.

The spears… I haven’t used recently enough to comment on. I remember them working similarly, but that was a long time ago.

Spears seem to always go at a fixed height compared to your character, regardless of how high or low you're looking. I'm not even sure they can aim up or down at all. They just kind of go straight ahead.