And here I always thought it was because, should your large die have an issue, you can likely sell it as a lower-binned SKU with the failed area gated off. This

And here I always thought it was because, should your large die have an issue, you can likely sell it as a lower-binned SKU with the failed area gated off. This way you end up with more inventory of a chip you intend to sell, or you have a high margin chip - win-win!