Thanks for your input. Your concern is not invalid. However, on a nice beautiful calm day like that, walking around on deck is one of the glories of sailing.
There are some other things to note too like we didn't have our horseshoe device on the stern rail nor was the MOM installed yet.
I used to take my now 16 year old sailing when she was a baby. I would sail on autopilot, and in that case I would actually wear my tether as going overboard would be a very bad thing.
On the days in the video the chances of going overboard are really zero. There are all sorts of risks in life that are higher than that like walking down a city street. Again, not knocking the point you were making, everyone should be aware of that.
Boat on auto pilot. Alone in deck. No pfd. Walking around w/o holding on. NOT a good plan.
Jim