Yeah I can imagine it being useful some things. It'd be easier to see how stable the ends are if it had images. There seems to be some scaling going on.
One of the challenges was to create a rigid chain that is pinned at both ends and droops in the middle. Chain links are rigid, so shouldn't stretch. In Arman's chain video he uses a path and and IK, but the movement is somewhat limited to keep the path length from fluctuating.
