No one is denying your experience.
The point is that accounting for any possibility of clouding changing over time, there's no reason to believe more that it will get better as it can also get worse.
I've read accounts of both things happening, but it is very much a matter of chance whether this will go one way or another because LCD manufacturing tolerances cannot be so strict that every single TV looks the same.
The most probable things is that it will remain the same.
So it's not a wise bet to keep an unit which has this issue from the begining .
And really not a wise to advice to keep it, what happened to your set won't necessarilly happen to others.
These sort of issues also can't be eliminated through calibration.
If the issue gets in the way of enjoyment it's much wiser to exchange it while still possible.
... But the OP for some reason decided to open another thread about the issue so this is moot.