It seems you suggest to base the boundary on how easy/trivial it is to make something go away from your posession, akin to "big man in a suit of armour — take t

It seems you suggest to base the boundary on how easy/trivial it is to make something go away from your posession, akin to "big man in a suit of armour — take that off, what are you?" line of reasoning. Well, the problem is that stripping tools from someone is not that much more difficult than stripping memory: some fair amount of violence would be necessary in both scenarios (blunt torso traumas vs. blunt head traumas).