HA a sword being too flexible to stab someone in the back is ridiculous. I still fail to see a point to why a dagger is better suited to stab someone. Consider the extra weight a sword has behind it. Like what was said, daggers only have their deadly, sinister reputation as an assassination weapon because they can be concealed, which is completely useless on a battlefield. I personally think only a fool would drop their sword to pull out a dagger.
Too gimmicky and gamey.