Because of windows based OS. Thing is that you can send a packet attack all day on my IP and I will not be affected. My Xbox doesn't have any place for a virus to go as all my stuff is on a cloud, and my decives have their own anti-malware better than some factory Firewall on my Router. Router Firewalls stay the same until you update Firmware. ALL the exploits stay the same until you Update Firmware. Since the Average Firmwares are over 6 months old that means you are cutting speed for about 1 week of protection per update.