I am a Mech E. While that amount of displacement may not be noticeable to the user, it is noticeable to the control system and could certainly throw things off, depending on the control system used. It would need to be accounted for.
It would need to be accounted for, sure. I'm not saying it's not. But it's accountable for. And hence why I say it's not an issue. Hell, the control systems might not even have to deal with it if you design your thing so that the cable stretch is beyond negligible. Then again, I realized we were talking about two completely different systems. He was talking about exosuits to practically replace people's mobility. I was more thinking of strength amplification where the suit makes your movement stronger - but the accuracy is still governed by the human.