For me beads are more for attracting fish, than weight...If I need to get down, I wrap the shaft of the hook with weight when tying, and I keep my flies as sparse as possible, or I will add weight to the leader (where applicable and legal)...In still waters the weight of the bead becomes more applicable, especially when suspending a fly or flies below an indicator...beads were not widely used when I learned to fly fish, and we still caught lots of fish...so I guess when all is said and done, fish can and will be caught with or without beads.