Sure Loon, quite right..
It would without a doubt, be easier to bring SP's into the game.. Being as the chassis are already here..
But it just isn't the same man.. Will be a huge gap in the game till they show.. AT guns have some serious advantages.. Move quicker, with their high speed tractors.. Make a very tiny target, and almost invisible when placed properly.. And contrary to popular belief, (with guns up to 75mm size) really didn't take any time to deploy.. Drop the gun, split the trail, set the brakes, toss in a grenat, Aim and BANG! When the guns got bigger than that, they lost their advantages, by being too big and herky to handle.. Like PAK 43 and 17pdr with the 360 traverse..
German units always had them mixed right in with the tank columns.. Often, if the Panzers were at a disadvantage, the tanks would retreat behind their screen of AT guns..