Richie, I agree 100% that a deer has the same genetic potential the day he's born as he does when he's mature. I don't believe the a deer with a narrow spread or fairly short beams is inferior. What I have seen and do believe is that some bucks just won't ever have big, wide, high scoring racks. And from a managment standpoint, once a deer reaches about 4.5 years if he isn't showing the kind of antler characteristics your looking for...take him out. I think it's silly to place an obviously mature buck off limits because he's not 18" wide or has 24" beams, he may never meet those standards. What do you do, let him die of old age? I know that one buck can only father so many fawns in a lifetime and it's not likely that any one deer is going to alter the gene pool, but if you want the best, get rid of the worst.
Of course, this is just an opinion and not meant to be taken in offense. :D