Any bends or crimps in the wire create localized stress points which fail early. For crazy high loads you don't want any of that, so the zinc method is the standard. But I think this particular implementation will be rethought.

The usual termination efficiency tables answer this in numbers. A properly poured spelter or resin socket is rated to hold 100% of the rope's breaking strength. A mechanically spliced eye with a pressed sleeve is rated around 90 to 95%, a wedge socket and wire rope clips about 80%. On strand around 3 inches thick an eye also needs a huge thimble, because bending stiff strand around a tight radius costs strength as well.

So for the biggest structural strand the socket is the default, which is why Arecibo got so much attention: sockets that slipped and failed well below their rated load, not an inherently weak type of end.