Title pretty much asks the qusestion, and here's the backstory:
I have a friend who just refuses to drop the gamepad and play D3 with mouse and keyboard. Funny thing is, he's usually a PC gamer but just feels so awesome playing D3 with a gamepad, that he refuses to come and play with me and our other pals in the upcoming season 19. As far as I know, D3 on PS is 1:1 the same as the PC version, so why is it that it's not cross-platform?