Hey well, that's what I'm here for.
As for your question Jon, (while I unfortunately can't get you an official response) you're probably correct- it's most likely a cost cutting option. In terms of its position against similar crossovers, the Tiguan finds itself on the higher end of the price spectrum; as such, VW would certainly be looking for any place where the can save a dollar or two. Also, you have to remember that most buyers will never use the car to its full, offroad potential, so the need for really high quality tires isn't paramount. Hope that helps somewhat!