@chyuan , I was rereading your earlier post and it is odd FRONT tires are 6 and worn more than the rear tires (7/32nd).
Isn’t the dual motor Y LR RWD-biased until more power is requested and then the front motor kicks in? I would expect more wear on the rears versus the front, and not the other way around as you’re experiencing. Have you taken the Y for a second opinion or measured the tire depth yourself? Maybe the Tesla tech is misreading the tire depth, or there is a big alignment issue. Is it measuring 6-7 32nds across the whole tire or just on the edges? Also, check and see if you need to rebalance if they’re really worn down that low. I would also check to make sure the wheel bolts are securely fastened to spec. If alignment is off, or wheels way out of balance, or loose, then that could introduce additional wiggle that grinds the tires down. I notice that on cars in front of me, sometimes their tire balance is so bad you can see the tires wobble sideways as the car is traveling forward. Please keep us updated.