> With IPV6 we can give every device it's own public address, but one major concern is that it could lead to an explosion of insecure devices accessible directly from the internet.

This gets repeated, but we've already got lots of home IPv6 routers and none of them allow direct access by default. You need to jump through some hoops to enable external access. Nobody wants public access by default and anyone who does it will get noticed and called out very quickly.