You are stuck on the theory of what is protecting this population. In practice, less than 1% of these users can or will turn NAT off.
Can you imagine how great things would work out with a public IP on all your nana's computers, NAT turned off, protected by the prowess of her Arris gateway's stateful firewall?
Can you imagine how great things would work out with a public IP on all your nana's computers, NAT turned off, protected by the prowess of her Arris gateway's stateful firewall?