I think it's mainly depends on camera movement. Games like I Expect You To Die expect the player to sit (as the game character does) with only camera movement

I think it's mainly depends on camera movement. Games like I Expect You To Die expect the player to sit (as the game character does) with only camera movement coinciding exactly with the movement of player's head -- do not cause motion sickness (unless we go into low FPS as you say). Games like Echo Arena where the entire time you are flying around (you see the environment moving around you) with no accompanying inner-ear sensation of movement, can cause instant motion sickness in some.