Consoles dont' need it. Though PC would probably benefit from it....and therefore so would Microsoft (indirectly). Which is why Sony has been fighting tooth-and-nail against it. Fact is, Bungie's hands are tied here. Sony---so far---only permits it with Fortnite. Plus Activision has negotiated these exclusivity deals with Sony...and Sony wants their money's worth (in extra console sales and player numbers) out the deals. Then there's the issue of mouse-and-keyboard and frame rate. Playing on PC would likely give PC players a huge advantage in The Crucible versus console players. Aiming precisely is easier with a mouse than a thumb-controlled joystick....and the higher frame rates allow for much higher server tick rates and in-game responsiveness.