Another anchor question: Why don't we use quick links rather than shackles to attach the rode to the anchor?

Seems to me that the same size quick link is about 20% stronger than it's shackle equivalent, and if you tighten the closure nut with a wrench there's
no way for it to work open. Even if you only tighten by hand and by some miracle (fish with fingers, crafty crabs?) it manages to work open, you still
won't lose connection so long as there is some tension on the rode.

Cheers
Marty