Got same issue with my front tyres but with Nexen tyres. both the inside and outside edges on both front tyres breaking up ( not cupping ) . No issues with rears. Have slightly increased air pressure to see if any change
A lot of it depends on the tire rubber compound. A softer rubber compound will give you tremendous grip, but wears much faster (tires are labled as "Summer" tires).I am only getting about 10K miles on a set of tires. The dealer can't figure it out. They kept saying that the alignment was perfect so it must have had defective tires. New set is showing wear after only 150 miles. The problem is only in the front and I am either loosing chunks of the tires or both are wearing on the outside edge only. So far the dealer has covered most of the cost. 2014 Touareg X.
Could this be a bad stepper motor?
Still sounds like alignment - get a good independent tire shop (not the dealer) to measure it. It has been shown over and over that the dealers are not NECESSARILY the source of all knowledge about Touaregs.