The defect rate always drops like that. But usually the big lucrative chips move on to the next node, and instead they're filling up more nodes in parallel.
The main cure is to build more fabs but that's hard too and they're not in a rush to ruin their own margins by scaling up too fast in the face of an uncertain future.
The main cure is to build more fabs but that's hard too and they're not in a rush to ruin their own margins by scaling up too fast in the face of an uncertain future.