You know, Rich, you've managed to neatly sum up the problem I've had with those little guys since I've first seen them. I'm big on belly in my folders, especially because I'm likely to take my knives hunting with me. A knife should, first and formost, cut, and a bit of belly allows one to get the most out of each slice or slash or simple, delicate draw of the blade.
I'm not well-experienced in the world of knives, but I do know that the original tantos that were made by the Japanese were much longer than those made by Cold Steel, and had a gentle curve to them of a few degrees. For their purpose, they had all the belly they need for slashing. They also had that excelent piercing tip to perform as a dagger, as well. Trying to translat that into a folder does strike me as a bit odd.