Holy fuck you're dense.

I have already addressed that you can have complete experiences from both single difficulty games and variable difficulty games.

The only thing that is unique about Atomfalls difficulty settings outside of the difficulty sliders is that there's a very very easy mode instead of a very hard mode.

Again, research design philosophy for video games. Because as other users have mentioned — you are objectively incorrect. In the exact same way as someone who believes that games should only have one difficulty are incorrect.

Edit: actually, fuck you — I've read the rest of these comments. You've earned the tag "Terrible at video games".

Edit 2: no no, I've got an even better tag — "IGN Game Journalist".