So, at this point(over 90 hours fucking around and barely starting chapter 6) i have a couple of tweaks for the enemies in general that would make the game a lot better and migth be doable via mods on PC.
For human enemies:
The A.I behavior is really good and more consistent than in MGSV, i would say that feels like a mix of rules introduced in MGS2 and 4, like formations to clear areas, line of sight to track you and no instant alarms where every enemy is tracking you despite the line of sight, etc. The problem as i see it can be divided in 2 things. The cooldown of the attacks and the damage of attacks, taking into consideration how much damage your weapons do and how effective they are, this would make the fights a lot more threatening and fun since the AI is already very smart and consistent in their behavior and the fact that you still would have the upper hand in movement and deciding how and when to engage.
For BTs:
BTs would be a lot better just by 1 tweak in my opinion, every time they grab you and drop you to the floor, they should drag you to a far section of the map like across a mountain or a river, etc. Optional, but not that escential, to encourage the use of items and movement, there could be BTs that drag you in the tar while you fight the big ones, forcing you to move carefully making use of ladders, long jumps, double jumps and what not to stay safe so that you can't escape the fight zone as easily. As it is now, it's pretty easy to trigger a mini boss fight, run away and have no penalty.