TLDR: Improve immersion and keep enemies from being such nuisances by having them avoid fights they cant win.
Its a common thing but nothing kills my immersion in a game faster than enemies that continue to attack or pursue me in spite of having no hope of victory and no good compulsion to enter a hopeless fight.
I’m running back and forth between resources and my base. Along the paths I take are crocodiles and rocknoses and both run right at me on sight. By this point dispatching them isn’t even a fight but I have to do it if I want to mine in peace. What were once challenging enemies have become nuisances and I just want them to go away.
Now I understand these species might just be dumb but you would think that they would eventually notice the smell of gore from dozens of their kin wafting from my armor and stay clear. The canines and cats certainly would.
The human AI is the least excusable. No one with rags for armor and stone for weapons is going to go out of their way to attack someone in full steel plate wielding a sword of ice.
There are, of course, instances where players intrude on enemy territory and the AI should attack anyway. In such cases it would do so much for immersion if survivors turned and ran after I cut down a few of the others. Unless he has had one ale too many, a cook shouldn’t stand and fight after I bisect the best fighter in two hits.