THE FEDEX PACKAGE arrived at Mark Barlet’s home in Harpers Ferry, West Virginia, on Christmas Eve 2016. He opened the box and gingerly pulled out a sleek black-and-white device with two large buttons: a prototype for the new Xbox Adaptive Controller. He touched the logo and tears came to his eyes. “I couldn’t believe it,” Barlet tells me. “I said to myself, ‘We fucking did it.’”
Barlet, 44, is a disabled Air Force veteran. He injured his spinal cord in 1996 at Andrews Air Base in Maryland. He can walk, but he suffers from chronic pain. One evening in 2004, he was at home playing the multiplayer game EverQuest II with a friend in Nevada who has MS. “Suddenly, her right hand just stopped working,” Barlet recalls. She didn’t regain…