It just so happens that this is easy to do with a cheap, short piece of rope or cord.
Knots are not made by materials, they are made by people ! If ones does not understand what to do, he will not do it either with an expensive or a cheap material, and he will not do it even if he is paid for it !
The problem, with knot tyers, is not only that they often do not understand each other... It is that they do not even try to understand, or they they do not even wish to understand, and they will never ever admit that they did not understand - and, of course, they will never ever admit that this is often their fault !
Any means that can help to avoid misunderstandings, ( and reduce type writing...), is a good thing, and should be utilized - even if it is not - strictly speaking, absolutely necessary. When we try to communicate something to a person, we do not test
his intelligence, we test
ours ! We should provide every means to facilitate this communication, otherwise we would never be sure that we tried as much as we could. This forum would be in a much better shape if people used less blah blah, and more and better clear, pictorial means of representation.