Can monsters suffer fatigue or stress?
If they can, this makes bookkeeping for the monsters potentially very tiresome.
If they can't, several critical effects become very pointless against monsters and thus no worse than a standard wound.
I can see the argument for both sides to be valid but unsure what the intent is. I can't find anything that suggests they shouldn't suffer stress and fatigue as normal but I'm a bit scared of how much bookkeeping that entails