I recall seeing an old theory that large brains are needed to get sufficient timing accuracy on throws. If I vaguely recall correctly, it made the argument that the number of neurons needed to get sufficient timing accuracy goes as the sixth power of the throwing distance, for a fixed size target.

This is still an active area of research

https://psychsciencenotes.blogspot.com/2017/10/what-limits-a...

Throwing is a very valuable hunting skill, since unlike melee it does not place the hunter at direct risk of injury by the prey.