I've posted about this before. A high lifeline set inboard a bit allows use of a 3' tether. That makes it much harder to find yourself on the wrong side of the lifelines. Old habits die hard. Side-deck run jacklines are still the norm. I don't understand why. Of course, if your rig carries away or the supporting shroud snaps, you have a different set of problems going on. If you follow the link (My history with shroud cleats), there's a bit more explanation. From the starting page, there are three more.

Nightmares I don't want in real life: 1). Tethered over the side slowly drowning, trying to bang on the hull to wake the crew below. 2). Releasing the tether and watching my boat sail away as the hypothermia sets in. Makes water boarding seem pleasant by comparison!

C.S. Johnson shroud fairlead:

Working at the mast with a short tether... a photo op in fair weather...