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GM doesn't really care about the longevity of the engine. As long as it gets through the warranty
period, that's all they care about.
The coked up valves will gradually reduce power and efficiency. It probably won't be that noticeable until the car has been traded in a few times. When it gets so bad with carbon deposits that it affects the drivability, the engine will be long out of warranty and then it becomes the owners problem.
Instead is designing a fuel system to deal with this valve coking problem, like an auxillary port injection system in addition to the direct injection, they decided to take the bean counters approach and just slightly change the function of the PCV system on the LT1 to reduce carbon build up. However, even with this design change, it still does not adequately address the problem of valve coking build up over time.
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