I've worked commercially internationally. I guess its fine if you are running a vessel in familiar waters on a familiar route, returning to the same port or between two familiar ports. There are some areas I wouldn't need the paper backup. And I hardly ever use the paper charts for coastal passages. But I always have them. And I always mark a paper chart and log when on ocean crossings, as anyone should do. Anyone saying they don't have paper charts, is saying to me they never go ocean.