If I remember well and it was an experiment between MCGill FSAE team and Scawen. Wings are not banned (rules are really open, and I think the rear wing was suppose to be attached to the triangles and not to the chassis, as it is also autorized) in FSAE and they make some heavy winged cars. But it is more weight, more budget and more drag with only a 600cc engine (you have to justify the technical dossier of your car). It is usually faster on the skidpad, but FSAE is not only about the skidpad. So I guess they did not see enough pros and never built the car this way, so in the end it was kind of logic not to release it in LFS.