We’ve discussed blunt weapons and differing types a little previously–here’s one thread I remember mentioning it several times:
http://discourse.stonehearth.net/t/feedback-on-combat/6433
Personally, I’ve suggested different traits for the various types of weapons to justify their usage over others in different situations (i.e. polearms are better against undead fleshy creatures, due to their longer length–boosts courage (since you can fight them from a greater distance) and higher resistance to disease (again, distance)).