In my mind when you open that door, the door is now open, you should be able to walk through in both directions not just one. If competitiors can upsize, they should be able to downsize too, otherwise you create a rule that favors only some and not all. Unintended consequences does not seem like a good explaination to me, but I guess that is just my opinion. I was just trying to understand that reasoning.

I get the 13in wheel tire thing, but they are still available they just cost more.