Unless your sailboat is tied up in a marina, actual sailing will take up too much attention. You can't just leave the radar on to warn of collisions, for example, it takes too much power and CBDR isn't widely available (tho' I suppose you could hack it up if you were running a laptop anyway) so you would need to visually assess every proximity alarm. Even anchored in a secluded bay you have to worry about being T-boned by a novice day skipper...