Not having a tuned bow may not be a good thing perhaps, but having accurate broadheads has got to be a good thing, unless you are the quarry, IMHO!
What I was eluding to formula......is the phenomenon where your arrow is not flying true.....but still hitting where you're looking. It could cause a loss of KE at the POI.....even though your arrow was flying exactly like your FP.
THAT is why I say that "some" shoot mechanicals as a "band-aid" to mask tuning issues. Not all.....by ANY stretch.....but with a mech......KE is so much more important.
That's all.