Just to let you know on this: Sony does not give 2 cents about how a developer manages their game.
So Blizzard does not want Mouse and Keyboard being used in their game on Console? That’s fine, then they don’t allow it. So keep the argument that this is on Sony out of here. Want to use Mouse and Keyboard for Overwatch? Take it to PC, keep it away from Consoles.
I’ve already talked to Sony about this very thing. It’s the 2nd half of the conversation. Take note as well that I also referenced things such as the Hori Tac Pro and even Overwatch itself.