I agree that legs didn't actually evolve for walking exclusively. They evolved for a myriad of purposes, including walking, running, jumping, swimming, and more.
The fact other parts of the body also evolved to facilitate these features is not a contradiction.
Evolution is like a parallel computation looking for a local optimum. When climbing the hills of the possibility landscape, various features that exist at the top of these hills can be described as the purpose of a particular search path.
The fact other parts of the body also evolved to facilitate these features is not a contradiction.
Evolution is like a parallel computation looking for a local optimum. When climbing the hills of the possibility landscape, various features that exist at the top of these hills can be described as the purpose of a particular search path.