For me exploits are also stuff that defies basic logic:
- A mob boss who keeps talking with you, while your group slaughters his men in open sight.
- Monsters who don't care, if there are appearing dozens of high explosive barrels out of nowhere.
- Attacking someone from behind and suddenly disappearing from his sight, without moving an inch.
Such exploits are mostly AI flaws, it's hard to tell how good they could get solved. Even so it's called AI, there is still no real artificial intelligence.
Playing warrior, using teleport or perma freeze enemies are not exploits, such things are just broken game mechanics that need to get balanced.