The Platform Navigation system is more for familiarisation during the build of the ship and for new joiners. I doubt anyone expects it to replace knowledge of how to get to compartment 9DN from 2HF once you've been aboard for a while. Think of it as a more modern version of the engineering or WE handbook.
As BEngO says, matelots are not cheap, so the need to keep that under control is crucial to actually having the capability. Aircraft carriers are no more vulnerable to missiles than any other ship (or indeed base) and while no-one would suggest you can automate shoring, casevac, concrete repairs etc, you can do an awful lot by reducing the need for compartment rounds and initial damage surveys via sensor networks and the use of fixed firefighting systems where appropriate.