sometimes when you evolve you lose cool things like prehensile tails
but fighting evolution does not guarantee you keep the tail, just that you gunk up an inevitable and necessary process
Your analogy suggests that this is a passive process guided by whatever combination of heredity and chance goes into natural selection, and not an intentional act.
We're not outgrowing our prehensile tails over hundreds or thousands of generations, we're chopping off any tails we can find based on a moral panic over old stories of people with tails.