Bottom line, it is a serious mistake to rely
on lifelines to keep you on a sailboat, even in moderate conditions. If
lifelines were an important safety feature there wouldn't be such a thing as
jacklines.

By that measure, if jacklines were an important safety feature there wouldn't
be such a think as lifelines...or flare guns for that matter.
All safety gear works together and ALL of it is VERY important.

RB