Found a good deal on iPad Pros recently so I went ahead and tried my luck again and lo and behold, I was finally able to get an iPad Pro M4 13 inch without any dead pixels or subpixels again. Out of the 5 I had, 3 had pixel issues, making it a 60% chance to get a dud. So I guess if you are in a similar situation, there are good devices out there.Just got another replacement iPad in and it also has a dead subpixel. At this point I'm just going to shelve the idea of getting an M4 iPad. Either tandem OLED is inherently susceptible to these issues or Apple has massively reduced their QC efforts. I had like 5 iPads lifetime and many more devices in hand at work and none of them had any display issues. Not going to start accepting it on the most expensive iPads yet.