Its notions of profit and wealth aren't human-aligned though. That's my concern - rationalist types have an idealistic view of capitalism because they're usually the benefactors of it (being typically wealthy and western).
Every final (non-waste) output of a capitalist system is intended for human consumption. Compost, pet food, sheet metal, etc are all intended to satisfy human preferences. Price signals ensure that only things which humans value are economic to produce.