All multi-use tools are not made equally. A matchcase/mirror/compass/whistle is not the same as a leatherman or gerber multi-tool. That being said, I don't consider the soil knife a replacement for any one-use tool. I consider it an affordable multi-tasker/back-up. Most of us carry a leatherman tool with a blade & saw and an EDC knife. So why not carry a soil knife in a pack as well as a folding saw & shovel?
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....he felt the prompting of his heritage, the desire to possess, the wild danger-love, the thrill of battle, the power to conquer or to die. Jack London