For Rifle this is simple. If it's down, where do you have to be? You are hunting, what could possibly be making you wait for tomorrow? I suppose it's possible to have such an inclement weather situation that you'd bail, AFTER gutting the animal. Otherwise, who cares that it's dark? Get on your headlamp and do your job, embrace the suck and get it done. At the barest minimum, gutted. I can't see why a deer would ever be so difficult that you'd need to wait to bone or quarter.
If it's rifle and you think you've made a marginal shot... Unless the "margin" is that you hit a leg extremity, the vast majority of rifle shots, even to the guts, are fatal in the very near term. Give them 1/2 hour and pursue. If you actually bump them, fine back out and consider tomorrow. How many stories about bad shots do you hear where the animal was dead inside 100 yards? Might some of them have been down but not out, maybe... but if they chose to lay down that close to where they were hit, they were in a very bad way and likely died quickly. Risk bumping them to find out, after a bit of a wait.
Archery is another animal. Especially in early seasons, I'd risk bumping them after a wait over waiting till tomorrow get recover my rotten animal. In late seasons with cold temps and a 100% gut shot, I might think on that a while longer.
Ultimately, I think there's far more risk to losing recovery of your animal to waiting than there is to giving a little time and taking on the pursuit. Once found, I can't find any excuse for not gutting, and as said earlier by grade, why take an easy job and make it a brutal one with rigor, frozen hide etc.
