To each their own, but the way I see it, I'm already in make-believe land when I choose to play random debut. I like using entire career for both fielding and pitcher stamina, and letting the AI decide what position the guy's gonna play his career at/who's gonna start and who's gonna relieve. I also like the DH, so that explains a little more of why I like this option, so that Edgar Martinez, David Ortiz, Frank Thomas, Paul Molitor etc can have positions to play for their whole careers so they don't get stuck rotting on a bench somewhere. In my mind, they're way to good to consign them to that fate. YMMV though, and it's your game so play it your way.