I disagree. Yes, people make bad shots for whatever reason, with all types weapons and that should be avoided, not repeated, etc. Learn from mistakes and mistakes will happen.
A deer can be "dead", no doubt about it going to die and the shot (bow, gun, crossbow, muzzleloader, rifle, shotgun, whatever is legal) and that deer, buck or doe or yearling, can cover a lot of ground or "disappear" before dying. A method to recover deer, especially one that seems to be fairly successful and a drone can be, should be used and that person should not be "racked with personal guilt, or all else that you mentioned". Animals are tough and I have seen some crazy things. Craziest was a doe I shot with rifle in 7MMSTW, for sure overkill and a killing machine. I shot a doe from the ground freehanded, and she ran close to 200 yards across a cow pasture. No signs of a hit, none, did not look hit or wounded in any way at all. I was 100 percent sure I completely missed. I rarely shoot freehanded at a deer and was upset with myself for not resting some how, but I was sure I had made a good shot. My brother came to me and I told him I was sure I missed. I ALWAYS look after shooting, no matter the weapon or how sure I am I missed. We walked to where she was standing and there was blood everywhere. Tracked her all the way across the field, and she made it 20 yards or so into the woods after jumping a fence. An entire lung was hanging out of the exit hole, a "10 ring" shot. She ran over 200 yards. No doubt a perfectly shot deer can go a long ways or make it into an area that it is difficult to find.