Now you've gone and spoiled it, by introducing logic and reason, plus facts!
One thing I found interesting using it (briefly) in the North Sea, was the extent to which permanent platforms were missing from the database. I've already said that the FMS will thow up waypoints onto the ND/PFD and generally they will also have a red obstacle 'blob' inside them when displaying the EGPWS. Even on the relatively restricted routes I was using, there were several waypoints that did not have 'blobs' inside them.
The problem of updating a database with mobile installations is a difficult one which I guess can only really be done by some form of real time active interrogation process. Something along the lines of Skytrac type technology, with the mobile installation transmitting updates of its position via satellite, and the EGPWS database downloading them and updating itself whilst in flight.
I still think there is room for improvement in the basic GPWS modes for the offshore role.