I see the stress for redundancy mostly about being prepared for multiple situations. As noted by the examples in the original most, most redundancy reflects having a specialized device in your main pack and having a smaller, lighter backup device on your person. Your main pack serves as the supplies for the main gamut of emergency situations. Your on-person backup serves for the scenario in which you cannot access your main pack.

This type of redundancy has objective purpose, and is so warranted in my opinion. If you find redundancy that does not serve and actual purpose, that would be venturing into “Too Much” land.