Banding in the output.

I was recently researching solutions to this and came across your post. Did some experiments and found a possible fix:

https://forums.unrealengine.com/development-discussion/rendering/1806158-tutorial-blue-noise-dithering-postprocess-material-to-fix-banding-in-low-contrast-gradients

Sadly not many people seem to notice/be bothered by this, as I haven’t come up with much over the years aside from deep technical approaches like in the Playdead talked linked in my post…

Hope this helps!