Or, more charitably, they are integrating that. In some industries, these high binned chips are a crucial competitive advantage, and I don't see any reason why they shouldn't validate the performance of each chip they sell (at least in HEDT, other product lines I can see having little or negative return from an approach like that).
Maybe they could even just make it explicit for all their products: market them by die type, configuration, and peak stable base clock.
Maybe they could even just make it explicit for all their products: market them by die type, configuration, and peak stable base clock.