Because it goes thru the eye twice, it becomes much harder to tighten. A Uni allows the line to move thru the eye during the cinch down. Going thru twice, and then pulling against the the small diameted of a tiny hook is gonna be a real challenge. A Trilene knot does not require that same movement around the eye during tightening.That so-called "fish-n-fool" knot looks like a standard Uni Knot to me,and the one to use when putting braid backing on a spool...albeit with more turns after going twice around the arbor,and those who fish the salt invariably use loop to loop connections for a few reasons.....never Nail knots.
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