You’d be shocked how crazy it actually is that human arms work the way they do.
Primate arm structure is what gives us the ability to throw with predictable accuracy and it’s something that just does not exist anywhere else in the animal kingdom.
It’s so exclusive that Goji Center used it as a part of their “improved” Indominus Rex to give it primitive tool use and also to add a bit of very disturbing world building about what exactly is in that thing’s genetic components.
The point here is that it is down to a very unique musculoskeletal pattern of our “front legs” that we can throw good, and make use of all that training to possibly throw gooder, and that other animals being able to do the same at the same level as the primate family would have made this planet exponentially more dangerous than it already is.
Imagine a mountain lion being able to chuck a spear. That shit would make living in the Rockies almost dangerous enough to justify how crazy half the people that come out of there are!