I’d be pretty fucking mad if my phone had dead pixels less than 6 months
That’s because screens are a mature technology. Twenty years ago, you expected one or two dead pixels in every brand new screen.
Here’s an example of a replacement policy from those dark ages:
The LCD display of products under warranty will be replaced if CTL determines that it has 6 or more bright sub-pixels, 6 or more dark sub-pixels or a combination of 6 or more bright and dark sub pixels.