They would have I think if they know what they know now. VW built a combination of a supercharger and a turbocharger for the Golf.
The engine was 1.4 litres and the supercharger had the task to build instant pressure from start on, as the fast flowing exaust from help of small supercharger will run the turbocharger quicker. Doublefeeding. Not really twin-turbo. It would not steel enginepower on cruise but the power is there instantly!