I think the line under ratings you mention came about with the advent of fast high modulus graphite rods. For many they are much easier to cast and gain extra distance if over lined.
You raise a very good point. I believe Hatch (?) magazine in the USA dedicates space in it's issue to such concerns in the US. I would like to see our own publications do the same. Fly Fusion magazine comes to mind as good one to adopt such a policy. The normal fair gets some what boring and redundant after a while.
Vibrant alone on slippery boulder and cobble freestoner streams is a HAZARD for anyone not wanting a fall. Forget about having secure footing. Had Simms vibram and exchanged them for felt, and suggested to the fly shop I purchased them at that they warn folks that they are not the same as felt on slick rocks! No questions asked when said I wanted to exchange them for felt boots after a days use.
That video brings back memories. I know that location and those fish well! Did 5 or 6 consecutive trips there between 2000 and 2006. At that time it was pretty much undiscovered. It is a unique fishery with a very interesting history associated with it.