Huh, didn’t know that, what a bloody stupid idea. Don’t own a DPF so never really read up on the newer types.
As for car engines being more advanced, sorry, I must correct you as you clearly know nothing about the marine world. Marpol Annexe VI has been in force for years now, SOX and NOX emission reductions are a constant source of innovation and technical challenges. They’ve been unsing water injection in place of EGR’s for years, camshaftless engines are old hat (they just make control too difficult) and maintenance and testing is far more rigorous than anything on the roads.
FFS, car engine makers go on about common rail as if it’s a new thing, ships were using it way before cars!