You could have posted a working link:
Is it safe to use a tether? - Practical Boat Owner
That are old news. After that many theaters sold on the market become much shorter and some have two lengths that allow you to chose the right size for clipping on different places to be sure that you don't go overboard
I use them at night except on flat water
and during the day when the conditions are bad (over force 6 upwind) or whenever I feel I am safer attached to the boat. I never use theaters with a length that allows me to go overboard
I have permanently rigged on the boat dinema lines to attach the theaters. They are white, thin, almost invisible and are as away from the side of the boat as possible.
Going forward with bad weather
, for me, the best support you can have is making force, pulling with the hand the theater while going along the line.
There are some sailors that do not like harnesses or theaters, the more famous one was Tabarly that was known of making fun of them and the ones that used them. One night he went overboard not to be seen again.