Apple Arcade is here, and you can play some of the subscription service’s many games with select models of Xbox One and PlayStation 4 controllers as well as Mfi (Made for iOS) controllers!
During Apple Arcade’s announcement, though, Apple gave the impression that all Apple Arcade games would work with gamepads (in part because the service will eventually also come to macOS and tvOS), but it turns out that’s not entirely true. Many games have interfaces solely designed for touchscreens. Hopefully that will change by the time the service comes to the Mac and Apple TV.