Did you know that besides Chevy, Buick, GMC, and Cadillac, GM has a unicorn division? By “unicorn,” I mean a division of GM’s design studio created to make the most stunning cars in all of GM-dom. This division’s most recent cars have been the Avenir, Avista, Ciel, Miray, Elmiraj, and Sixteen, just to name a few. Almost everyone wants this division’s cars immediately when they see them. There’s just one problem: GM’s unicorn division never actually produces these wonderful cars. And that’s the puzzling part. If the unicorn division can make a business argument for creating its cool-looking progeny, then why can’t GM make a case for actually producing them? Or said a different way, if GM is serious enough to invest the time and resources to create these involved…