I think that minimum redundancy is a wiser ethos. There are a couple of places where the weight penalty versus cost of failure makes the decision a no-brainer.
In my case, that means bringing aquatabs to back up my primary water treatment system and a second way to strike my stove. An extra 2 grams for aquatabs versus 4 weeks of greasy diarrhea? Check. Ten grams for a second mini bic or small fire steel versus cold soaking meals that I designed for cooking? Check.
But I do agree with you that bringing less in general frees you to move faster, go farther, and enjoy the journey even more.
bring one of everything. No redundancy. The gains from being ultra light, single-item-multi-purpose, are immeasurable