It doesn't hurt to try and it also lets the company know there is a problem that they need to look into fixing in the future. If customers don't have a problem with something then the company has no incentive to fix it.Thanks for the reply.
I was aware of the problem with dark corners/vignetting screen uniformity but I didn't know it can get worse over time. As you can see from the picture from September 2020 corners looked quite good without visible darker line in the left top corner. I don't know if I can live with this. I will have to wait and see. Do you think Sony would change panel after using TV for a half year or its something that I just have to accept?
You could try, but I personally think there is very little chance of sony replacing the panel. It's considered "normal", which is a joke. You'd likely get a replacement that had the same problem anyway. Those are two different pictures you're comparing so I can't tell if it's gotten worse from those pics, but I believe you anyway. That's really concerning if it's gotten worse. It's bad enough to begin with. Also, I can still seek dark corners in the soccer game picture, albeit not very obvious like in the other pic.