Elon Musk envisions a future where brain implants could transform how humans interact with technology. But Miguel Nicolelis, widely known as the "father of brain-machine interfaces," sees things differently. Having pioneered research into invasive brain-machine interfaces himself, Nicolelis now advocates a less invasive approach, prioritizing patient safety. So how far should we go in connecting the human brain with machines? And when it comes to the future of brain-machine interfaces, who has the better argument?