Eventually, all plumbing pipe connections leak. If you don’t specify the right stuff, some leak sooner than others. Maybe they need double the number of people who review the ship specifications, before building anymore... Cross connection situations are usually caused by people who didn’t know what they were doing.
And this is why steel ships have a maximum life expectancy of 40 years or so. It isn’t feasible to replace all the miles of pipes and valves on the ship.