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It's not too uncommon, especially nowadays, even on some no-nonsense cruising designs.
Depending on how the rig is "sprung" and how solid the chainplates are, it might not be any less robust than having double lower shrouds. Usually, you'd like to see a bit of pre-bend tuned into the rig, with aft-swept spreaders, and the chainplates positioned aft of the mast base (rather than even with it.) Sometimes this would include a babystay too.
On some earlier designs, this was not always the case. Often, the single lower shroud and upper shroud were tied into a single chainplate even with the mast, with perpendicular spreaders. That is an arrangment that would give me some pause for serious off-shore work.
In the mid-late 90's (I think), Practical Sailor published the results of some research they did on why quite a few folks were experiencing mast failures while sailing under headsail alone. It had become an issue because, with the advent of roller furling, more sailors were opting for a lazy sail under headsail alone. Practical Sailor found that one almost universal common denominator among the boats that lost their rigs while sailing under headsail alone, was that they had single lower shrouds.
A few years back, the late Robert Gainer and I had a discussion about this subject here on SailNet. I seem to recall that Robert was somewhat skeptical that the single lower shroud could be the problem with the dismastings, so you might want to dig up that old thread and review his thoughts.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT