I cannot speak for others, but I voted to close because the question is pob in my opinion. Take the title for a starters:
Why are successful human rock climbers so dissimilar to Hominidae primates who spend extended time periods climbing?
- What is a successful human rock climber? In my humble opinion, someone climbing a boulder without falling off ten times is a hero. The mainstream primate would topple out from its tree laughing about that.
- What is dissimilar? A few kilograms of muscle tissue more or less? I find the difference between a squirrel monkey and an orangutan (both tree dwellers) a lot bigger than the difference between a human and an orangutan.
- What is an extended time period? When I boulder, I find 5 minutes on the wall a long time. A gibbon spends most of its life in the trees.
These are just a few terms taken from the title alone that will fuel debate rather than generate explicit answers. And that's the definition of a pob question -
[P]rimarily opinion-based [questions are put on hold, because] discussions focused on diverse opinions are great, but they just don't fit our format well.
Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than on facts, references, or specific expertise.
Although the question may be valid as indicated by others, as of now I view it as a question that holds promise, but needs work and is rightfully put on hold.