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Define "time to time" as in once per dive, once per year, once per lifetime? If you are having frequent LP hoses failures then you are having a problem that you need to get to the bottom of before somebody gets hurt.
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No LP hoses here, only one stage, no internal parts exposed to seawater, only one O ring and it is not needed, utterly reliable, an extreme example and not the solution you seek but elimination of failure prone equipment is a valid means of improving overall function and safety, at least as much as is adding multiple layers of equipment to compensate for the added faults that added equipment presents.
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I don't know of any scuba regulators (modern, vintage, or tween) that could really be called failure prone. Although I'm sure there are a number of associated gadgets that many divers have rejected due to reliability problems. But whatever the failure rate is (1 in 1,000 to 1 in 100,000) adding a completely redundant gas supply essentially doubles the zeros in the denominator.
I don't carry my pony often. Shallow and/or with my wife/buddy, I just don't need it. But deeper and solo it is with me. It is extremely unlikely that I will need it. But the very slight burden of carrying it is worth the risk reduction to me.