You're thinking that shorter lines can be thicker without tearing under their own weight, so the optimal mix is a few heavy lines supported by a larger number o

You're thinking that shorter lines can be thicker without tearing under their own weight, so the optimal mix is a few heavy lines supported by a larger number of light ones? And/or heavy lines for safety, many light lines for stability? I suppose that makes sense, though it still seems weird that they needed that many types.