Funny what time and BBQ cooking practice will do to your food preferences. Your sandwich looks good to the eye, and I have no doubt its taste was spectacular. Prior to 2002, given the choice of shredded beef or ground beef for Any Mexican dish, it would have been shredded hands down, and that sandwich would have made me drool. Hard to put into words for fear of offending...Now days, it is almost hard to look at!
But the thread has made me think that I need to try mushrooms in my next Cheesesteak, I think a good marinated, then sautéed mushroom would add great flavor to the sandwich, sorry to go off on a tangent!