Answer to the OP title is "NO." I have a frame perfectly sized for me which needs a 30mm setback post and really probably more setback to get the balance right. I still have too much weight on my hands. It all depends on one's personal body proportions. There are no rules, not really. KOPS is an interesting fitting standard but doesn't apply to everyone. There's no mechanical reason for KOPS being a good thing. It's just a thing which sometimes gives good balance on the bike. A person with a big chest and shoulders will need more setback. It's not simple. Just go by feel. Note that having the seatpost clamp far from the center of the saddle rails can lead to an embarrassing saddle rail failure, an end of ride kind of thing.
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