You are describing "Swiss cheese" accident avoidance.
Each one of the 7 firearms rules is a separate slice of Swiss cheese with holes. You now have 7 layers to protect you against accidents, but none of the layers are perfect by themselves, hence the holes. The more layers you remove... the greater the chance that somewhere a series of holes line up and let misfortune through.
It is true as someone above said that you can never be safe enough and that the seven rules are the bare minimum. Next time I'm at the gun shop, I'll get one of them orange nylon thingame markers to always stick in the chamber to flag an open unloaded action. That will be my personal 8th rule.
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