It was reported that the OLED panel on the Pixel 3 XL came from Samsung while one on pixel 3 from LG. It can’t sit well with some as we know that LG is not as good when it came to the Pixel 2 XL display last year.
It was reported that the Pixel 2 XL display was a burn in question along with the preservation of the image, grain, blur and blue tint. We do not know if LG fixed any of them, but it looks like Google has not lost confidence in them yet.
Early testing showed that there were no problems with the display, but only time will tell.