I don't think it is. I've managed a server directly connected to the internet with a US government IP, and it was being port scanned from a Chinese IP within minutes of being turned on. If you are a target, then there is an adversary out there that is patiently waiting for the opportunity to exploit an unpatched vulnerability in new installs, as if your security is otherwise good it might be how they get their foot in the door on your network.

(In our case I really did have a "5 minute plan" to login as soon as the fresh install was booted, setup a firewall, lockdown the ssh server, and install fail2ban ASAP. I'd then check system logs to see if anyone got in before proceeding. Time was of the essence.)