Why did the developers added parameters for many enemy NPC to hold their position in combat?

[orangedeal]

DMP_Combat_HoldPosition_xxx
DMP_Combat_HoldPreferredPosition
DMP_Combat_HoldUntilEngagedPosition

I have only one explanation - this was done to make life easier for the player, otherwise the enemies might start attacking in droves. Or I'm wrong and this was done in order to make life more difficult for the player, so that he would go to the enemies and they would wait for him in different places? I tried to remove these records and the enemies behave differently - they really are a crowd. I'm thinking - what is more realistic, how this would happen in a real life?