>>717888687 (OP)
When it's not fun. What kinda stupid question is that, OP?
You put realism into a game either when you want immersion, or because it helps make the gameplay more compelling.
Battle Brothers not having any women in your mercenary band because it's a low fantasy game is the kind of realism that helps immersion. Same for only being able to hire niggers in southern areas of the continent, meds in temperate areas, and nordoids in northern areas.
Meanwhile, being able to break a wooden shield by taking an axe swing to it and thus heavily debilitate the enemy's shield wall is the kind of realism that helps gameplay. All examples of good realism.
Meanwhile Cataclysm having vitamin deficiency is the kind of realism an autistic tranny thinks up because it's realistic. It's not something a player will think about in the context of his ingame journey, therefore no immersion benefit, and it's not something that severely changes gameplay for the better, therefore no gameplay benefit. Bad realism.