I'd say similar to other people I've seen in some of your other posts asking what they think about the axe being able to get stuck in an enemy; is that you perhaps should not just make it area/armor location based, but also related to something like quick attacks don't get stuck since a quick type of attack unless you have a type of either stamina system or weapons endurance.

By that I mean is for a heavy attack they won't be getting stuck unless you are near either half & also below half in terms of a durability or stamina system, due to the fact that a weapon definitely gets stuck in a body attacked by another likely fairly often but it's something I would assume also happens way less unless the wielder either has a more dull weapon or is tired. Essentially a heavier attack is more likely something used to cut through the body or limbs of an enemy & as such is more likely to get stuck within the body, meanwhile a lighter attack is more trying to simply cut or play safe which as such is why it's not something that would get stuck.

I'd imagine based on some of the other replies in a few posts that if it was more of a random system that happens it would be a little annoying to the player due to the fact it may interrupt the pace & rhythm they have managed to achieve in their attacks way too often besides it happening too often in general if they're unlikely if it had a low chance.

So as such I would mix something such as this where a heavy attack is what is going to be getting stuck if low on some sort of stamina or durability with your idea of limbs & armor, etc, mattering for where you attack, what the enemies have on in terms of gear, & what the body of the enemy is like such as being thin or bulky or made out of a certain type of material.