I doubt there was any "conventional wisdom" to begin with. As Shadorne said, there is simply no reason to bother suspending speaker cables off the floor.
They're not susceptible to low-level vibration the way your turntable or CDP would be, and static (from man-made carpet fibers) is unlikely to be an issue; if it was, high-end speaker cables would be shielded.
Unfortunatley our passion has an equal mix of genuine products and snake-oil sellers. If you're really keen, try to find some old glass or ceramic mains power insulators. They look ok and cost much less than branded ones.
They're not susceptible to low-level vibration the way your turntable or CDP would be, and static (from man-made carpet fibers) is unlikely to be an issue; if it was, high-end speaker cables would be shielded.
Unfortunatley our passion has an equal mix of genuine products and snake-oil sellers. If you're really keen, try to find some old glass or ceramic mains power insulators. They look ok and cost much less than branded ones.