Great test, thanks for taking the time to film that and for sharing.
Conclusions will vary of course. As always risk aversion is a personal judgment, but it can and should be informed by objective information and collaborative discussion.
That prusik was impressive. Can't remember if I heard you say what brand it was. I just added the Aerohunter prussik/tender kits to both my tether and my adjustable bridge. I am impressed by how effective they are at 1-handed operation. Not as smooth as my Ropeman1 (which still lives on my LB), but close enough for me.
The Ropeman1 has received lots of praise on this site, and for good reason. It is an effective little piece of kit. I wonder if people had experienced the use of a prussik tender prior to hearing about the Ropeman whether they would have ever felt the need to switch.