Ah cable dressing. My point of view is any cable fit for purpose with a design and construction that has been considered as fit for purpose by the manufacturer, will have some form of material around the wire (whether that is copper, silver or string or a combination of wires), which acts as insulation. You don't buy a cable with a warning on the packaging, telling you to keep the product well away from all other cables or it will not function correctly. Heaven forbid.
It does make sense to run speaker cable away from trailing mains cables as much as is practical, but surely the cable manufacturers have thought of these concerns in their designs. This point also applies to the feet of hi-fi components. The manufacturers must surely consider the design and construction of feet on their separates, but a lot of people seem to think they are an after thought and have been stuck on at the last minute, without any thought of their anti-vibrational or damping properties. They feel the need to add wooden cones and the like. An analogy would be buying an umbrella and being concerned about not using it in the rain. My main, rambling point here is I think a lot of us get too het up about things in our systems that firstly have been carefully considered by specialist designers and manufacturers, and secondly, have no real impact on the performance of our systems. I am also saying a cable manufacturer would be pretty negligent if they sold a product that wasn't fit for purpose and affected the performance of everything it touched.