I found that odd as well.
However it is clear to me that the game intends to have a talent for almost all specific instances but no overlapping talents.
So its easy enough to houserule / create a talent with your players just make sure it doesnt overlapp.
I'm toying with this :
1st lvl = +1 when fighting with maces/clubs
2nd lvl = When causing damage, your victim will be knocked prone (if able to be knocked prone, talents, monsters etc)
3rd lvl = Add a D8