Your absolutely right though I tend to disagree though I could be wrong but have done enough comparatives to believe I'm right.{ I hope thats clear
} One of the main things a fence does for a manager is create the 'opportunity' for deer to age. If circumstantially that opportunity isn't there and the opportunity for age cant be impacted then exploring tactics to maximize longevity and health are mostly irrelevant . That said wether a deer is inside an enclosed property or on the King Ranch how well they age and their health status is a function of the nutritional plane, social stress, social structure and environmental constraints.
The point I was trying to make is I do believe the deer on my farm perform at a higher level later in life that the typical herds I have been involved in. And I believe it is because of the nutritional plane as well as the subtleties of not having them eating foods drenched in poison as well as population dynamics and the relationship to the habitat. Course if I went and started shooting all the bucks at younger ages that wouldn't matter fence or not.
As an aside we are seeing bucks on the ranch reach very old ages. I have one buck from last year that I know to be a 16 yr old. One of the best bucks I ever took from the ranch was a 10 yr old. We generally look to take trophies in that country between 8-10 when the majority show peak performance. That wasn't so when I first bought the ranch as 6 was considered mature. But after 25 years of intensive protein supplementation the deer live longer and show high quality much later in life.
I can offer corresponding experiences from my time on the King Ranch where the deer peaked out much earlier in life and die offs were more common but I never introduced any nutritional improvements in that country. we focused most resources on quail.
Happy to continue this if it is interesting cause its cool stuff. But as you point out its not relevant to most as most herds in the country simply have almost no chance of full age expression and herd composition.