I've been giving this thread some thought. I have always been an efficiency nut. A few years ago a buddy of mine asked me why tree people don't use SRT more. That began my quest. Now I own a whole lot of stuff (like B) that didn't get used much, and now occupies a space in the truck,' cause I might need it.
Every time I transfer gear from the truck not needed on the job site, I have a heck of a time deciding what to take along. Most of the time I have stuff I didn't even know I brought. On the rare occasion I have forgotten to bring something. No harm, no foul, I can always get back to the basics that I learned with. A rope,and a friction saver (cambium saver) and saddle are all you really need to get up a tree.
The irony is that no one has ever been paid to climb a tree, we are paid for what we do while up there. Hell that even goes for cat rescues and cone pickers! I guess the original question has as many interpretations as personalities on this site. I like the SRT to get up the tree, I pull 1' of rope for a foot of gain. DbRT is less than 1/2 as efficient. but requires less horsepower.
With the right equipment SRT can be work off too. The argument about 1 rope is BS. There are scads of video out the showing just how little a handsaw tap it takes to cut even a DbRT rope set-up!
Efficiency, like beauty, is in the eye of the beholder! IMO
BTW I am a little ugly!!!!
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