I think it's basically all the same when backgouging and welding the second side, but seems to me it's different on the first side because ceramic or copper is just a little more difficult to weld to than steel backing, particularly if the root is wider. You'd weld a wider root with a different technique when welding to ceramic or copper backing as opposed to welding to steel backing, wouldn't you? Also, if you already know up front that you're going to have to remove the backing and backgouge the second side, which prequalified joint (if any) would you use? One with a smaller root opening designed for backgouging, or a wider root opening that's designed for backing, but not designed for the backing to be removed, and then the second side gouged and welded? Seems that technically speaking, neither joint type could be used, could it?