A lot of our lines don't have that much load on the core (if any); but i still agree about a sharp bend loaded, especially cranking around said sharp bend, as in lowering. As the inner part of the line becomes compressed, the outer becomes stretched around the tight bend. The stretched part of the line then becomes a region of fewer fibers, that carry all of the load, therefore they are leveraged to carry more load than usual on each strand, than there would be load per each strand from same load on a straight line that was load bearing evenly on all fibres.
Being compressed, the inner part of the curved fibres would be carrying force, but not supporting load per se, for rope only supports inline pulls (because it only resists on that axis) and then only in the tension (stretch) direction on that axis (not compressed). This is why 2 slanted lines are leveraged, becasue only the inline/sine value is supporting, their across force/sine values cancel each other out (becasue there is no across ressitance, therefore no support by that factor). i know that sounds like gobley **** to some, but all we can do is present it a number of times, at a number of turns, for it to become familiar, and useable to you. But, it is how it all Worx... In flexible lines bent so, we might see breakage first on outside of curve; but in contrast; on stiffer lines might se breakage on inner / compressed part of curve.
If the line runs from ground, thru ring, then back towards ground, that is sharp bend(clsoed U), being cranked around ring(not as bad with same bend sitting still), ring bearing 2xLoad - frictions. But, if line runs around spar, then to ring, or comes down from higher up etc., then we don't have quite the doubling effect, have more load reducing frictions (load leg - frictions = control leg, then half their angle of spread gives the amount of force of that some total of both legs applied to ring). These scenarios also give less sharp bend to line.
i do like the krab solution better, as they can be spread bend out to soften the bend, and also give less concentrated frictions, that then also too, have space between them to dissipate heat (as opposed to all heat concentrated in one point). Also, krabs can be installed and removed in the bight.
