I personally like the age threads, but mainly because I just like seeing pictures of deer. As far as knowing the age of a deer, I like to shoot mature deer instead of any deer. Always curious what others thoughts are too.
Also, I have learned a lot from reading some of those threads and implemented it to see if it holds true for the herd I hunt. Just another dynamic of hunting for some, the management practices provide a sense of accomplishment when someone kills a big buck and they can attribute their efforts to growing a buck of that caliber.
Not sure why you say people can't post a lessor deer on the forum. There are plenty of deer that don't meet your listed requirements that get posted. As with HF/LF, bow/rifle, public/private, guided/DIY, etc., there will always be people that disagree simply because it isn't the way they prefer...to each their own.
Not sure how management minded people bothering you is any different than a person that shoots "any deer" bothers management minded people. To each their own, just enjoy it