Understand what you are saying. In school we were taught that this time of year was a good time to do counts and age as they are not yet carrying any winter fat build ups or pre rut musculature which would typically skew age higher than what is.
Also their coats are thinner allowing better observation of evidence of scars etc.
I always found, for me anyways, that it was easier to age south Texas deer and north country deer (Missouri, Arkansas, Kansas) than hill country deer.
3.5 to 4.5 aging on the hoof is always very subjective anyways depending on range conditions and the probably of supplemental feeding on body appearances etc. imho.
Field data observations and samplings have found that aging on the hoof usually skews to animals being aged older than they really are in many instances.
Maybe in the future, with the advancement in biotechnology, hunters will someday have a hand held, range finder type of advice that they can just point at a deer to know his age.

But then we would not enjoy our "what age is this deer" threads on TA.

Always enjoy your knowledgeable post ttha.