Here's a link to some info from the maker of safety wire showing a double wire installation which is a bit tighter than what's on the E9.The safety wire still should be redone since it’s not going to keep anything from loosening up installed like that.
It also states: "The single-wire or single-strand safety wire installation method is more applicable in situations with closely spaced fasteners such as electrical systems."
An E9 isn't an airplane or race car, but it's nice looking when it's twisted tight and there's less chance of vibration issues as well as being more secure.