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To deepen into the issue a bit, one problem with 2008 BMW Sauber was that although it was initially fast, it was complicated and difficult to develop, like the 2011 Renault. I think if BMW management saw genuine potential in the car and hence genuine shot at the world championship, they would have gone for it. But at that moment they had to make a difficult choice - go on with a car they won't get any further, or concentrate on a clean sheet design with which to attack.