I think tying a running bowline makes the most sense if you are climbing on a base tie. Its quick safe and secure. Tying two butterfly knots above that, whether you even have a dedicated kit or not is not a huge extra ordeal. It does however provide an instant, safe method of lowering a climber...that doesn't require prusiks, backups etc.
I really believe, that in almost all instances of a climber not being able to rescue themselves that the climber is either pinned, or unconscious with a lanyard.
Nick,
Your system is not instant, it requires someone on the ground to do stuff after the mishap. Take the wasps, if it takes 30 seconds to rig, that is way too long; those little bastards can do a lot of damage in 30 sec. It also requires a designated line, 8, couple beaners, something to cut line with (an activity that is frowned upon in many rescue circles).
The system we use requires one eye sling, one beaner, a Petzl Rig or l'd and one rope (300' 11mm static) It is set up before the mishap and does not require cutting a line. Every rescue situation is different and there are some that cutting lines exist, but building a system that requires cutting a line when other options exist is what I am questioning.
Some folks dont think having the option of being lowered from the ground is worth it, or practical. During a mishap in tree work this is one of the few useful things a trained ground worker can do. The way we use it the access line stays in the tree for the duration of the job. After being used by the climber for access, it becomes an access line for a rescuer if needed later in the job.
No passing knots, no cutting lines, simple, no extra gear, no hockeling of line, build in backup the 8 lacks, better automatic feathering of friction not built into lowering with an 8; what's not to like about it?
300' static is a bit bulky and requires some coin to obtain, The Rig or l'd costs more than an F8,some training for others on the team required.
Do you recommend dumping the rescue line out of the bag with your system. Having the end of the the line sneak up on the person doing the lowering has been know to kill people in other high angle arenas.
No system is perfect, but this is just the one we prefer to use. Take it or leave it. I'm just chiming in to state some reasons why we use this one. And, it's below zero again on a Saturday morning and I'm sitting on my [pick a different word] by the fire pecking at this stupid confuser.