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If I remember correctly the shape allowed the blade to be easily removed after piercing armor. Tanto's are IMO a little harder to sharpen because you have two bevels to worrie about but its not really that big a deal. The thought that they can stab better is a myth, most of the time a tanto creates more resistance when piercing because the whole height of the blade has to push through.
Overall I like them and carry a BM 760 daily, it has yet to fail me in a cutting task. Most of the time we are use to having a belly on a knife that allows you to rock the knife to cut through things and with the tanto there is no belly. Like anything you just need to get use to how it cuts.