My opinion on this topic is similar to many of yours.The state of the animal,the state and skill of the archer dictate the decision.I will say that even though my competence level at longer distances is better than it has ever been my selection of shots has become more conservative.My practice sessions are typically at 50 and 60 yards,those are the distances that I do the majority of my shooting.
Even with complete confidence with shooting a stationary target at those distances I like my shots at deer to be thirty yards and in.I don't care how fast your set up is at 40 plus yards a deer can take a step from the time you release your arrow to the time your arrow arrives.If you could be assured of a complete miss no problem! What is more likely is a wounded or lost animal.
I would work toward putting yourself consistently in closer proximity to game than stretching your effective range.I am specifically talking about whitetail deer.My comfort level would be considerable further on a much larger animal that isn't as wired or doesn't have the reaction response that a whitetail has.