What is "purpose"? Evolution is rational: it constantly produces species that survive better. Sure, there are many ugly "hacks" and things it could do better; y

What is "purpose"? Evolution is rational: it constantly produces species that survive better. Sure, there are many ugly "hacks" and things it could do better; yet we also produce things with hacks, e.g. enterprise software. Evolution not producing wheels may be analogous to humans not solving very large problems (e.g. computing very large numbers) in our heads; today we solve very large problems with machines, but likewise evolution has "developed" wheels through us building them.