Ok so this is the cake pan thread.

They can shrink the amount of mix in a box but the hard limit of shrinking is the standard set of pans that everyone has. There are also bundt and springform pans in addition to the rectangulars. So if they shrink the amount in the box, as the original article mentions, they have to keep changing the recipe to increase the air and the rise so it still fits the same pans -- maybe badly. Or they just abandon the larger pans and don't offer instructions for them and it's up to the baker to buy multiple boxes and do the math?