Sawbacked knives are found wanting because we need that rigid spine for splitting, blade strength and they seldom work well anyway. Why? If you could examine a fine crosscut saw, the design is extremely sophisticated. The thickness is actually greater in the teeth than the blade body,or, the teeth are "set" or bent outward in opposite staggered angles. This chisels a "kerf" of material physically removed. A knife is actually splitting material along fibers. The kerf is therefore actually wider than the saw, preventing binding ( until the material actually folds onto the saw from simple structural fatique. There is a channel for the chiseled material to flow out of. If you look at the finer SAKs, Opinel or various swedish folding saws; they actually have this sophisticated geometry. Now look at sawbacked survival knives. The spine is still the thickest part of the blade. there is no real kerf. Thin knives slice better than thick because you are pushing less mass into the cutting medium. The full thickness sawback is working under this additional disadvantage.