The difficulty in answering these questions lies in the name, utility knife. Unless you want to create a specialty tool, it's just a hunk of metal that holds razor blades. Fold-ups, retractables, self-retracting, fixed blade, snap off, etc. all exist. I own all of these types that I've mentioned and each has it's own role. The fold up stays on the tool belt. Retractable in the electrical bag and other bags. Fixed blade for making gaskets. Snap-off for cutting insulation. Self-retracting ***** and I never use it, even when I was box cutting for 4 years. My point is, it's difficult to innovate without narrowing your scope.
A word about box cutting: no one is going to put a utility knife through its paces like someone who works receiving, packing and unpacking boxes all damn day. You drop it, holster and retract it hundreds of times a day, even use it as a door stop (not at the bottom, the corner up top where the torque is). The one knife design that ever made me work significantly faster was a double-sided Husky (C.H. Hanson also had a very similar version, Husky probably rebranded it). Standard blade on one end, hook blade on the other. It's not the same as having a guthook, you get better access with a hook blade. Just flip it in your hand and go. The problem is they never lasted long because of the cheap internals. If someone could make a good one of those I'd buy it again.
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