... who doesn’t want to live his life according to what some insurance company recommends to somebody else
Me either, Peter; full agreement there. Ortlieb's diagram shows a dangling strap, and that was my first thought, too.
I initially dismissed the fresh warning as so much lawyer-talk, but when I started to play with mine, it would occasionally come loose with little if any effort.
Looking at my bag in the photo, I'd snugged the strap up underneath so it wouldn't be in the way of the headlight (I run a rear mudguard on the front, so no problem with the tire catching the strap). Doing so places some slight tension in the downward direction...same direction the strap anchors release.
I think part of what spooks me is the memory of a truly beautiful young woman back when I was at uni. She was riding past on her bicycle and caught my eye -- just in time for me to see her long-strapped purse slide forward off her back and catch between one fork leg and the front tire. Before I could utter a word, she rotated around the locked front wheel and slammed face-first into the pavement, hands still on the 'bars. I dashed forward, called to one of the stunned bystanders to call for an ambulance, and stayed with her till it arrived. She was awfully quiet, not saying a word the whole time. From the looks of it, she suffered a broken nose, jaw, and cheekbone, and must surely have incurred a concussion. It made a real impression on me, enough to pass on the warning for individuals to take or leave as they will. Once aware of the potential for problems, it is a bit like the helmet issue -- people will choose whichever course suits their risk valence.
I much prefer the design of modern HB bags to those available in the past. A member of one of the tour-groups I led in the '70s-'80s had an Eclipse handlebar bag with stabilizing bungees going to the front dropouts (as in the photo here:
http://www.vintage-trek.com/images/trek/Mann510/side-black-door.JPG ). One day a bungee detached and got wound up in the spokes. Rather than snapping, the nylon-clad bungee pulled the bag down and off its steel support, and
that got wound up in the works as well. Fortunately, it all happened after a stop when the rider was just starting off rather than at full speed, so no fall or injury resulted. Small wonder bungee-stabilized HB bags disappeared from the market after Eclipse went bust.
All the best,
Dan. (...who is glad he no longer has to worry about institutional liability and tour groups)