Irrespective of who has a boat ticket. Who would you feel more comfortable with? A group of stewards in charge of lifeboats in an emergency or a deck crew that have practiced this regulary. Be the same as deck crew having a cooks ticket and working in the galley. Personally I reckon it would be like having our ambulances manned by people equiped with first aid tickets. Much prefer that they are manned by crews that have been trained for such purposes.
That's the way the mop flops.
My thanks to Brian for this site.