This article is showcasing how far even the most bleeding edge technology from recreating the functionality of basic human organs. Heart doesn't seem exactly the most complex organ structurally wise, especially compared to things like lungs, liver, or kidneys. But we can't even make a sustainable replacement for it that wouldn't require 4 kilograms of external batteries that you'd need to recharge multiple times a day.

I can't wait for the future where artificial organs and limbs not only match the usability and functionality of the normal ones, but actually exceed it.