Extending rappels -> stacking -> partner checks!
Rappelling has been identified as a notoriously dangerous part of climbing, and it's nearly always because people make mistakes or errors of judgement.
In my mind, one of the strongest arguments for extending rappels is to make it easier to "stack" rappels: Rigging multiple people for rappel BEFORE the first person leaves the upper anchor, so that everybody can see and validate that everyone is correctly rigged.
Otherwise, the last person to leave the anchor won't have anyone to independently verify the safety of their rappel rig... And when one partner is more experienced than the rest, that person is often the best/only choice to rappel FIRST, in order to establish the lower anchor on multi-pitch rappels. That leaves the *least* experienced partner(s) to rig their own rappel(s) with less experienced guidance.
Besides stacking, I'm also a big advocate for two other practices that I rarely see in the wild:
• Practicing rappels more often.
• Adopting a fixed checklist of rigging components for rappels, a la your standard tie-in checks.
Note that all of these practices are designed *specifically to compensate for HUMAN ERROR*, which is by far the biggest source of accidents in contemporary recreational climbing. If climbers specifically adopt rappelling practices designed to compensate for human error, then we should expect to see a decline in accidents.
On the other hand, if climbers reject these practices because of their own (misplaced IMO) confidence in the infallibility of their own judgement? Then I expect the bodies will continue to stack up 🤷
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*(Not my video, but SGBW stands out amongst the sewer of Short-Video engagement marketing garbage as a genuinely thoughtful, useful, and responsible content creator. I couldn't find a more succinct description of the arguments for extending your rappels.)*