I only argue when I disagree, say things I agree with and we'll argue less lol
I don't think this is an "exploit" at all. Running at someone, throwing a low kick and getting your knee hyper-extended is going to hurt a lot, and honestly, getting low kicked in the shin when you have no weight on the leg wouldn't hurt all that much (compared to knee hyper-extension). I also don't think you can call this a neutral position, because one fighter has all the control over how and when the exchanges happen and if the fight stays there for any extended period of time. If you mean neutral in terms of damage, sure, but I don't see anything wrong with that.
I only mentioned the fighters because Diaz is probably the most vulnerable to this, and McGregor or Barboza is probably the best person at doing it (at LW). Like, someone with higher leg health probably wouldn't have been in a health event, and someone with lower power might not have put Diaz in a health event.