In an earlier age, it would have been a limited production Cadillac for a particular clientele at a high price, introducing technology that would trickle down later to the rest of the GM lineup. Had they done that, GM could have used the car to demonstrate their engineering chops in new tech, with small numbers that could be tended to more closely, as all new tech must be, and explained as “exclusive” service.
The General did in fact build a Cadillac version as a concept, under the ungainly name “Converj”; after hemming and hawing for many months, GM decided to add it to the Cadillac line as the “ELR,” not to be confused with ELO, at a price which is supposed to undercut Tesla’s Model S, which starts at $50k before you pick your battery pack.
Had they started with a Cadillac, I suspect they would have sold just as many — or just as few, depending on your perspective. And when this technology filtered down to Chevyland, it would have one built-in selling point: “Hey, this is like that Caddy, only 15 grand cheaper!” But now the Cadillac faithful won’t touch it, because it’s going to be a glitzed-up Chevy. Can you say “Cimarron”? (Said the guy who drives an Infiniti based on a five-grand-cheaper Nissan model.)