Op you already got your question answered but here is an analogy to visualize the situation better.
When making cookies every cookie should be made of the same ingredients for they all came from the same reciepe and the same bowel.
But when you put them in the oven some come out AAA perfect, some are AA, others are A, B, C, D or F.
At the factory the chips are tested and sorted and the best ones are made i7s. The non AAA are still good just not perfect. Since not everyone wants to pay $350 for a chip but would pay $250, $200, or $175 Intel purposefully removes features and makes the cookie smaller and they may not add frosting to justify why the i7s cost $350 and cheaper i5s cost $175 to $250. Intel rather make the lower graded chips into the cheaper skus and those pristine perfect chips are treated as their stars.