I used to work for a company that made an ultra low budget android tablet. We gad dead pixels on like 10% of them. Our LCD provider would tell us the same thing. Unless there are at least 3 dead pixels, they aren’t taking them back. We changed our LCD provider ASAP, but we sold probably 1-2K of those POSes. That’s probably 100-200 $50 tablets with dead pixels.

But at least our tablets were $50 pieces of trash, not $2000+ MacBooks.