And by the same coin there are a lot of reasons they would. Drivers can be fork lifted by implementing KPI compatibility, and that can be done in a shortest pa

And by the same coin there are a lot of reasons they would. Drivers can be fork lifted by implementing KPI compatibility, and that can be done in a shortest path fashion or done in a way to realize new protection from the new OS. Development environments can be preserved indefinitely with image activation and personalities. The first never mattered to Apple, and the second was effectively realized on OS X.