YHR and ausf both made great points. I will add that simplicity is hardly "flavor of the month" as the simple Tamiya battle rules have endured since the IR battle system was first launched. Along the way it accepted a Leopard 2A6 into the gameplay without too much problems. Sure, there were advantages that the Leopard had in speed of movement as well as speed of rotation, but Tamiya artfully hampered the Leopard from firing on the move and freezing when it got hit. So any advantage conferred onto a class of tank should not come without a corresponding penalty. And WW2 tanks could actually strategize to take out a Leopard, even if it was a one-on-one situation.
Realistic, it is not, but it sure is fun. In Danville, Doug Gasser was driving around in a pokey little M4 Sherman, but he was easily one of the best tankers out there. Its not about the shape of the tank, its about the driver.