Surely if it was a simple fix, they’d have “fixed” panel variation. After all, returns have an impact on their bottom line.
Sometimes, for mass production at the cutting edge, there are limitations in what can be achieved.
Moreover, some of this is user behaviour. If you can’t see any issues in normal content, do they matter? Whereas if you slap slides on immediately and start analysing every square inch, you’ll probably find something and never be able to look past it. Again this is not just a problem for LG, it’s a waste of time for the person who does this and has the hassle of returning multiple panels.
Personally, when I buy a Tv, I watch as much as I can and varied content. If I don’t see issues then I’m happy. I avoid slides/etc.