GM are the corporate analog of most Americans who believe they are the centre of the universe and the rest of the world doesn’t exist.
For the last 40 odd years the entire car market has been about consolidating and building “world cars” to get the economies of scale to compete. GM completely turned their back on that concept and kept running regional markets except when they were foisting Daewoo shite onto Holden.
Holden designed and made a world sedan in the VE Commodore and GM just let it die after the GFC. GM should have been championing their best divisions to make world cars not just cars for their own market.
It should have gone like this.
Holden = World large sedan, wagon and Ute with the Commodore.
Opel = World small hatchback with the Astra.
Thailand = World SUVs with Colorado/Acadia
Murica = World muscle cars/supercars with Camaro and Corvette and to a lesser extent large pickups like Silverado etc.
Instead GM packed up their bat and ball and walked of the field as they don’t even understand how the game is played. Meanwhile companies like Toyota and VW are killing it using the world car concept and increasing volumes by having multiple brands selling effectively the same cars (VW with Skoda and Toyota with Lexus etc).