Consider all of the other Final Fantasy games. Why are there so many enemies and wild beasts in one area at one time? You take two steps forward and would be knee deep in a enemy territory. Random encounters were numerous!
And it wasn’t uncommon for a monster to fight side by side a soldier. Now, one could assume the soldier trained the monster and used them as fighters in the war, like combat dogs. Then again, some of these animals just seem to be around.
And what about battles with multiple enemies on the field? Wouldn’t a leaf bunny be the prey of a Darkwind (such as in Final Fantasy VI)? Wouldn’t wolves attack the goblins like they would the humans all the same?
Enemies run away if they consider you a threat they can’t win. You can sneak up on them. They can sneak up on you. In Final Fantasy VI and XV, they could surround you, kinda like a pincer attack. Think of the new idea of combat already hinted in the Final Fantasy games: enemies attacking enemies. I’d like to see a Final Fantasy where different beasts and enemies fight each other to survive.
We could see some of this in Final Fantasy XV. But I would like for this to be even more of a strategy for subsequent games when defeating enemies. Divide and conquer.
Maybe, beyond the horizon, you can see enemies fight other beasts. Might make for a great show. Before getting to you this might lower their health. But what if you want to get more exp? It would be a race to get to certain enemies before they do. What if your health is low? You’d have to make a decision if you’d want to get more. Taking risks would be apart of the strategy.
Imagine a world where many of the enemies are actually powerful in some areas. Their struggle with other beasts in the area would actually help to survive in this situation. Enemies will have a line of sight and become aggressive when we or other enemies cross their territorial boundaries.

“Aww man, I wanted that enemy to take on that beast, but he ran away. Now that beast is after me, and he’s pretty powerful. Should I take him on, or should I run for my life?”
This is what I propose for Final Fantasy XVI, hopefully, the Final Fantasy reality based on fantasy.