You can’t fix compression artefacts, low bit rates etc, I think more like... LED backlight masks some of the compression artefacts but its still apparent when its really bad, OLED being perfectly black shows it much more.
Yup exactly.
It's why I always say that this is where LCD can be better than OLED as a lot of the issues, which are in the source itself are often "masked" because of LCDs drawbacks, noise (not so much an "issue" as like TWD, they go for that shoot "style" on purpose ), gradient banding and so on being the main ones that come to my mind.
That's is why I ensure I get the very best quality content there is now and playback through MPC-HC/madvr