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.
I agree. There is reundancy then there is redundalunacy as we call it.
My gear (depending on season and trip location/distance) is pretty constant and only the most critical items are redundant. Short of losing the backpack, the odds favor you in that you will have whatever is in your pack(s) at your disposal.
Does this work for everyone? Probably not, however after years and 1000's of miles in some the most rugged and remote terrain in NA, this has worked well for me and friends even in some precarious situations. I have found that knowledge, skills and mental resolve are much more useful then carrying questionably redundant items.