"I've been running my GPU at 100% capacity twelve straight hours a day every day for the past six months and it broke. I demand a new one!"
You'd be laughed out of the Apple Store.
I don't think you understand what a "thermal stress" problem means. It's not about your laptop running "too hot" for 12 hours a day for six months, it can handle constant hot just fine. It's when it has to change between running cold and running hot that the packaging itself starts to warp/come apart/develop stress cracks/pull off the MB/whatever the problem is this time.
That means:
1) Running at 100% for six months = FINE
2) Running at 100% for 20 minutes and then needing to go home so you put your laptop to sleep = BAD. The GPU temperature plunges quickly from toasty 80 Celsius to the temperature of your room. Do this often enough and it buckles like a cheap bridge.