Why hasn't WAR been switched to blunt?

[Rhais]

While I can appreciate a good quip as much as the next guy, axes have never really been "slashing" weapons. Their small cutting edges are more likely to stick in an unarmored opponent and really shine in their ability to perform blunt force trauma in armored ones. The only difference between a hammer and an ax is a bevel.

You don't ever see executioners take people's heads off with a hammer, or see people choose a hammer for chopping firewood.