X2 ...Dont know if I would say its the leading factor in lost critters but it very well could be up there...
Those heads will be very dull...Absolutely get a couple packs of replacement blades..they are cheap compared to most heads...$20.00 for enough to replace three...
There are methods to top up heads to get them razor sharp but shot into targets destroys them for hunting IMHO...keep them for Broadhead tuning next year...
I go a step further...I even rotate my arrows in my quiver...#1 arrow can get even get somewhat dull being pulled out quiver six times a day..after a week I make it #4 and Bring up #2
I replace blades every year if in quiver...
The #1 will still be plenty sharp for a "Coup De Grâce" shot for a finishing humane shot if needed...
Neil