I believe rapid switching is even more reliable than DBT testing (I know Mrty will disagree with that) as in DB testing, memory still does play a part.

But you can do rapid switching under DBT, especially with an ABX box
Test subject will do this on their own without instruction as they discover the advantages of this.


But for cables, not only effects are subtle, but one can not participate ahead of time what type of effects it will have on the sound

If the cables are comparable, 12ga -16ga, it is very predictable, nothing will happen.