There are several reasons. The first is that axes are generally intended for rough use, such as chopping through a log, splitting wood, etc. A sharp edge means a thin edge, which means a relatively delicate edge. By thickening relatively quickly you get more metal in the blade which makes it able to withstand the force of a swing of the axe.
Another issue is that if you see an axe in a movie or television show it is most likely going to be a prop made of rubber or latex foam. They can’t have actors running around with weighty weapons or sharp blades for safety reasons. It is only a matter of time until someone is cut, someone accidentally chops their foot, etc. You just aren’t going to get a firm, razor sharp edge out of rubber or foam.
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