They have always acknowledged that the rough cut is part of the authenticity of older OPC cards. They have said in the past the sheet cut cards are considered to be altered or trimmed... and whether some have gotten through...
Keep in mind that OPC cards were not cut with blades at the time, they were cut with sharpened wires. In my mind, for most OPC collectors, especially anything that is pre-89/90, if there isn't a hint of some type of rough cut, you have to be somewhat suspect about it.
Just as 51-52 Parkies were mixed with a cement mixer... the kind of technology used for cards in the past are nothing compared to the modern era. If you saw a 1952 Topps Mickey Mantle that was absolutely clean with razor sharp edges that you didn't see come out for the pack yourself, I'd be pretty hesitant, graded or not.