I think it is necessary to add a function, which helps define the real movement of a rope or cable in an assembly, because we use these types of elements in our designs daily. In addition, other programs allow you to do so.
This function could be defined by the type of material, or perhaps be able to create a scketch-anchored, thats varying once the parts of the assembly move.
Something similar can also be applied to liquids inside a vessel or cavity.
I imagine that it is something complicated to program, but it would be incredible to have it.
the function could be called, "natural behavior"