Not finding an obvious "use" for something doesn't mean it doesn't have one. Especially when that thing has survived millions of years of evolutionary pressure

Not finding an obvious "use" for something doesn't mean it doesn't have one. Especially when that thing has survived millions of years of evolutionary pressure to preserve useful stuff and cull useless stuff. Remember "junk DNA"? Turns out it wasn't junk. Anybody calling "useless" any of the outputs of nature's exquisite forge is likely to be proven wrong.