I think that many readers will not understand that seasoned PNG pilots have a contantly changing definition of safe visual flight, depending on terrain, weather, time of day, escape routes and a gut feeing that tells him/her if it is better to give it away for another time. And it doesn't have too much to do with VMC/IMC definitions.
If we allow commercial or competitive pressures or any other reason to degrade our established definition of safe visual flight, the safety of the flight is no longer within our ordinary minimum accepted conditions. The object is to get the job done without crossing that line.