It would be great to hear from Michelin what they find, but that will never happen. I've had friends with the old Pilot Powers that had problems with delamination and outright failures get told tough luck by Michelin and while things may have changed as to "better safe than sorry", I'm thinking they must have seen something of concern that they replaced rather pro rated and will likely have it analyzed to confirm if the tire batch had any issues.
Gr8adv, as a side note and YRMV as to limited sidewall wear, but if you look above at my tire photos that's about the point the pegs are scraping so there is a huge amount of unused rubber or big chicken strips if you prefer.
Cheers all, enjoy safe travels