Yep the most advanced....
Apple investigates reports of iPhone 8 splitting open
http://www.telegraph.co.uk/technology/2017/10/02/apple-investigates-reports-iphone-8-phones-splitting-open/
Apple Confirms Reports of iPhone 8s Splitting Open While Charging
https://www.extremetech.com/mobile/256783-apple-seriously-investigating-reports-iphones-splitting-open-charging
Out of million of iPhone 8 models delivered, exactly TWO have had a problem, Minnesota. TWO, count them on the arms of your body. Most likely a bad case of glue heat curing. It happens.
There’s a thread on FR on this.