Some mechanics that make sense in terms of BSGs goals for realism
Tree branches falling in high winds possibly killing players
Specs of dust disturbing players eyes commonly, must cycle an animation and apply ointment to treat, eyewear makes it less common
PMC randomly sneezes and you must tap space bar as fast as possible to hold it in before alerting enemies
PMC has a chance to become sick for typical IRL duration, colds,flu, bronchitis etc.
Chance to jam finger in lids of containers
While walking have a chance to twist ankle if not on level terrain
Turning head too often will cause neck pain
Caffeine withdrawal headaches
Urination/defecation during raid requires TP
…
What else?
Source: https://www.reddit.com/r/EscapefromTarkov/comments/qifnxt/realism_mechanics_thread/