Right or wrong, I get my broadheads, sharp. The test I have always used, is to take a medium size rubber band, holding the arrow under my arm, I loosely drag the rubber band over the broad head. If the rubber band cuts, before the 1/2 way point I call it good. I use rubber bands, because they mimic the texture of an artery. If I shoot a broadhead, I will touch it up. If they sit in a quiver for a minimum of a month without being shot, I touch them up. One thing many forget is a well razor honed edge, will begin to get dull over time, with oxidation and minor rubbing in a quiver.
I have used a lot of broadheads over the decades and I know that there are more experienced guys than me. But as long as a quality fixed blade broadhead is sharp, and put through the vitals it will do it's job.