I’ve never noticed this on older iPads. We all pay a premium for Apple products and one thing which should have no compromises is the display. People need to check this out in the store first. Once I notice something like this it bugs the hell out of me. Remember the issue with some iPHones which looked like they had spotlights coming down from one side? I just had to return mine. The guy in the Apple Store hardly noticed it but I got a full replacement and the new model didn’t have the issue.