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Throwing rocks is really useful too when you never get tired while running. So we'll chase down an animal for twenty kilometers then pelt it with rocks.
Animals: "ow! Ok, I get that this is a- ow! good huntin- ow! Hunting strategy and I'm too tired to- ow! Run. But this is- ow! Just humiliating."
Another animal later: "oh these ones just have very straight sticks, at least that won't be as bad as the rocks--WTF THEY THREW IT INSIDE ME!"
We really do break the balance of the game. Aimed accuracy of throwing things, high level detailed communication and social interaction, that same vocal range means we can imitate animal sounds to trick them into running off cliffs, can literally run animals to death, very high level intelligence allowing planning and tool use.
One or two of these would make us an op apex predator.
uh yes, I can totally do all that!
That's where the high level of communication and society comes in. Not every individual needs to be great at all of it.
high level of communication
Ah yes, I can totally do that, too.
None of us have needed to be able to do any of that for quite a while. We've found far easier ways to survive, thanks to that advanced communication you mentioned.