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I never once liked this statement, and I dearly wish it would go away.
Everything in scuba is arguably to some extent an equipment solution to a skill problem. If we had the skill to breathe under water whilst seeing where we were going and were able to make good time doing it, we would not need a scuba unit, mask, or fins. While that is an absurd, extreme example, it is true to some extent of every piece of scuba equipment. We can dive with a tank cradled in our arms if we wanted to--a BCD simply makes it all easier. We can propel ourselves with fins anywhere we want, but many DIR divers use scooters without apology. Every piece of equipment we use in scuba makes our diving easier in some way, so every piece of equipment is in a way an equipment solution to a skill problem.
For me, the issue is this: does this equipment provide an unnecessary ease while at the same time creating a potential problem, such as a failure point? Does the potential problem override the added ease? If it is a potential failure, how great is the potential for that failure, and how serious is the failure should it occur?
To me, those are the critical questions that must be considered. A simple phrase like "equipment solution to a skill problem" short circuits that thinking, much as the bleating of the sheep in Animal Farm drowns out rational discussion.
I use a similar explanation to my students when talking about equipment choices, except I use the term "convenience factor" ... one must always weigh the benefits of convenience against the potential drawbacks of that convenience. A common example is a purge valve in a mask. What problem does it solve? How hard would it be to solve that problem if the convenience were taken away? And what are the drawbacks ... real and potential ... to adding the convenience.
There are many such choices to be made in scuba ... and not all of them are going to be the same optimal choices for each diver. In the end, we all need to decide what conveniences matter to us, and what drawbacks ... real and potential ... we are willing to put up with in order to enjoy those conveniences.
... Bob (Grateful Diver)