>>1262816>Carrying a large sword sheath on the back as seen in anime and manga is not practical and the sword is difficult to draw and may even stab the person trying to draw it.Anyways, this was an Internet Argument a few years ago, and the internet did what the internet does best: go to great time and expense to prove someone wrong.
The eventual conclusion was that a back-scabbard is entirely practical and doesn't need mechanical parts, electronics, magnets or AI. It just needs to be designed differently than a waist scabbard, as shoulder pad would be designed differently than a kneepad:
https://www.youtube.com/watch?v=0EWi2DnDoaI