IF YOU TAKE AWAY ALL OF HUMANITY'S ADVANTAGES, HUMANITY WILL HAVE NO ADVANTAGES!
And if you take away all of a fish's gills, it will not be able to breathe. What is your point?
Humans should be dead by nature's terms.
We only exist by brainpower and since we are that weak, before we could fully develop brainpower we would be massacred by all of our natural predators.
Therefore my conclusion.

Jesus. Shut up.
I am not jesus i am sir bearington my good man
Your conclusion is flawed. It ignores all those other adaptations that we mentioned. Did you know that some of our ancestors made tools not because they thought them up but rather it was an unconscious compulsion?
Give a monkey a stone axe, watch how it may just swing it around a bit and bash it here and there but do nothing actually with it.
Early human would be just as useless.