I'm also in the crowd that thinks the Commander shouldn't have to have lifelines or the rear pulpit for day sailing.
But if everyone on board is wearing a life jacket, then even the kids should be taught what the D-ring is for.
It wouldn't take much to get everybody to accept that.

I was just with a bunch of older types on a Triton learning how to set up the spinnaker.
I'm sure that hooking onto a jack line if it had been rigged would have seemed ridiculous or sissy since there already were too many lines to get correct and too many turns to make on the foredeck.
But imco some sort of drill that involved the simple act of clipping on to the jack strap, and unclipping it to a new position should have been included.

There is the argument that falling overboard will teach one to be more careful.