Hello
The straps are just a other design. They have a much lower resistance then normal connector ended units. The used material will be to "soft" and brake if you make it to a massive "rope". And the best from all is that every hobby mechanic can make them with just a bowl to heat up the Sn and then dive the ends in. The crimp tool for the connectors is not everywhere to find.
However on the battery strap is a other material used becouse the battery acid will make soft copper more trouble then the steel rope, But old 911 have also a strap as ground cable on the batttery post. The benfit is that the wing nuts allowed to loosen the strap fast without removing the battery. On the soft strap a low clamp force on the nut will vibrate loose.
Grüsse
