I use waders from a boat and most people I know that FISH do too because you're prone to get out on the beach and work a small stretch from the bank at times.

There is a difference between being on the river going down for the fun of it and being on the river for the purpose of fishing. While drifting a river and fishing you will purposely position the boat in areas that are somewhat perilous, in front of or slightly to the side of log jams, big boulders, and chutes, pulling hard on the oars to keep your position. If an oar snaps you will instantly start to spin and momentarily loose control because you're still pulling on the other oar through that stroke. This very situation demands a hightened sense of awareness and preparedness because 'Murphy' has been known to apply his principles in these very instances. Having backup gear is prudent. I've been fishing Alaska, Canada and Washington for 30 years. Backup resources and attention to detail are part of the reason I'm still around to partake in these discussions