There's a military adage that no plan survives first contact and Phantom Pain displays this every time you spend 15 minutes scouting the perimeter, planning a perfect ingress / egress from a heavily
fortified compound, then creep in, start popping headshots on unsuspecting guards and have the whole thing go to shit so you switch to shock and awe as you dash to and from your objective, ducking in and out of buildings, laying down cover fire, and make a
safe zone to extract your target before calling in a helicopter strike to reduce everything in the area to a smoking crater before walking out of the ashes and flying off to your next objective all because stupid Quiet didn't notice one target on her scouting run.