In reply to galpinos:
The problem here is spreading load across a wider section of cable and creating a soft radìus for the cable to bend around. BD used the extra wraps to do this, distributing the load more effectively and preventing the sling from pinching the cable until a higher load.
A carabiner has innate rigidity and an already present soft radius, usually of the order of between 4-7mm on the rope bearing surfaces.
Using no means of extra wraps means the cable can crush the sling down to a very small cross section, but the longitudinal fibres are still extremely strong. The cable on the other hand will have a minimum bending radius, the structure of the cable will mean that excessive tensile forces will be present on the outer radius of the bend, above the yield strength of the steel. Individual wires will begin to snap and as these go, the next later of wire sees the same forces move towards the inside radius and the same happens to these until the whole lot goes. Hope that's not clear as mud?