There was some medically inadvisable biohackery going on with magnet capsules implanted into fingertips I remember from a while back. Thereafter reporting being able to feel electrical fields as they move/vibrate. A similar sort of neuroplasticity being the compass belt that pops up every so often. Is it possible to make a medically safe magnetic materials that could produce similar effects with enough responsivity where the brain can pick up and adapt to the stimuli?

For the same reason that replacing the engine in a car does not make the car larger. Some games can't do binary patching because of the nature of their randomly packed data files makes the entire pack change. So they have to replace the entire data store instead of just inserting a new version of a specific file.