People who don't understand what a performance autocross/track tire is/should be should get off this guys back. These tires are in their PRIME at that depth. People who do performance driving regularly will often shave them down to that depth range to eliminate tread squirm.

My rs2's didnt show wet weather compromise until the inside of the tread was just about gone. my azenis went even further.

Sure a tire shop wouldn't sell it at this depth, but do you realize that they only come with 8/32nds new!?