Shorter blades are generally better at stabbing than slashing, on account of lacking leverage. This is particularly true for the shorter, "knife-sized" end thereof - at "shortsword" lenghts they start having enough weight and leverage that there can be practical merit in designing them for the cut.
Anyways, the line between a large dagger and a short sword is notoriously fuzzy (not that the one between "long" and "short" swords was all that clear either), and when you get down to it somewhat arbitrary - typically, a question of end-user perception and which exactly the thing is "worn as" so to speak.
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