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.
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.
Sure, but did cobras that spit venom exist before us stick throwing primates? Apparently not really. Spitting cobras seem to emerge in Africa when the hominin lineage emerged ~ 7 million years ago and in Asia around the same time H. Erectus moved into Asia ~2.5 million years ago