You would be surprised at what you may miss. When you evaluate accused wallhackers do you at least enable wireframe during the viewing of the demo? If not, you shouldn't be evaluating it. When you enable wireframe you can see models through walls, which will allow you to see what the accused is seeing. You might notice him shooting glances through walls, react in a strategic manner to defend against what he sees through the wall but isn't directly looking at. It isn't as cut and dry as you think. That is why pro admins use wallhacks for demos. Things you couldn't possibly see or notice become plain as day.
