Redundancy has gone too far if your kit is so bulky or heavy that it is bothersome to carry and gets left behind. Or if it slows you down to the point that it creates issues.

Your not deeply enough into redundancy if you are at significant risk of death or serious injury because you don't have something to work with.

In principle it is ridiculously simple. In application it is a complicated, multilayer, puzzle that pits the specifics and probabilities inherent in your particular situation against your preferences and tolerance for risk, burden and frustration.