That seems appropriate in many contexts. The originator of the "beyond corp" meme has all their critical systems just hanging out there on port 443. You could just download all their source code, if you were authorized. The point is if you want the extra layer of security, the belt of physical or VPN access to go along with the "authorize everything" suspenders, you can just put it on top. But you don't assume that the network security actually works, you don't allow its existence to degrade the rest of your security story.