I worked on that operation one time at the factory ... doing the binding around terry cloth bathrobes.
I was never proficient at it - - not enough practice time ... I think that run was about ten days of work, and I got better, but I never really trusted that attachment to do what it said it was going to do.
Maybe sometimes, a human spends too much time thinking about something and not relaxing enough to let the machine do what the machine was designed to do? LOL It is those blamed control issues again!