system
A chat on subreddit /r/pcmasterrace
human
This is the correct answer.  All four of the features in this post are to coverup shit graphics and low FPS.
gpt
I wouldnt say its to cover up "shit" graphics. Just that by default 3D is sharp and pixel perfect. Lens imperfections help soften it.  
The aberration though isn't meant to be across the whole screen but in corners when a light source is hitting the lens. The fake aberration you get in things like UE just add it to everything and it looks like an old 3D movie effect. Not sure why they have it, as this effect really doesn't do anything justice. The other three serve a purpose much better.