i would say the biggest thing on a boat for safty would have to be all the asfty gear and everyone on board knowing how to use it if and when the time might arise and apart from that the skipper has alot to do with it just as a good driver on the roads
main reson for alot of boating incedents would have to be a laps of conctration from the skipper
as for me i think 16foot and bigger is what you need for going out wide
i only have a 17footer and yet get out as wide as the big cruisers do doing the same things thay do too