What is trusty?
The point of using double-braid polyester is so that there is minimal chafe and wear against the chain in the presence of mud, sand, strain, pressure against a drum or capstan, etc. No three-strand could be as trusty in this situation. The purpose of using 3-strand is not primarily ease of splicing it is for stretch under load to reduce shock loading against both the chain at one end and the boat gear at the other.
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