That'll change with time. I'm behind ISP NAT for IPv4 but have static IPv6 direct to all my devices in the home. My ISP ran out of IPv4 relatively early so had

That'll change with time. I'm behind ISP NAT for IPv4 but have static IPv6 direct to all my devices in the home. My ISP ran out of IPv4 relatively early so had to go this way. On the other hand, this won't really change much for the firewall issues named above. Computers are too insecure to expose them all to the internet, all the time. We'd need pretty radical changes in how software is written to create a truly flat worldwide network (which has never existed before).