But it does make you much less vulnerable, because you're only vulnerable to the tiny proportion of attackers who have discovered a zero day exploit.
That's true of older versions with security updates too.
Which is precisely why I use carrier pigeons from my secure locations to use the internet... All disks in and out are block-level scanned and analysed before loaded at the application level, and USB ports are hot glued closed, along with peripherals hot-glued in place.