Kaplan, later on in the thread, acknowledges that native peripheral support is "very much [Blizzard's] problem" but they need "help from [Blizzard's] partners." I'm not entirely sure what sort of help he's talking about. Usually the console manufacturers leave it up to developers to pick and choose what peripherals are allowed for use in their games. So if Blizzard wants full mouse and keyboard support to be natively implemented for Overwatch on PS4 and Xbox One, why not just add support for those peripherals?