The class began with factory sheetmetal and was a pro class then.... so why not now? At least panel cars like they were for quite a while. It was originally intended to showcase what could be done with stock bodies (or very close to it). You are right, they probably can't go 200 mph without some aero, and I get it - that bell rung a long time ago and you can't un-ring it. My primary objection is not the application of some aero enhancements - the drooped front end era cars didn't look exactly stock, yet were closer than now - it's the wholesale chopping, bulging, morphing, and scaling down. In typical drag racer fashion; if some is good, more is better, and too much is just right!
I wasn't intending to single out Camaros - they made the Dodge Darts into two doors, and the factory didn't even offer one! But it's all about the history my friend. From the point of view of those of us who were there in the beginning, we ask why did y'all want to screw with this pro class by allowing so many major body mods? It truly was an exciting class to watch, even thought the racing wasn't always as close (or fast) as it is today.