I think, there are certain qualifications in respect to an individual sport. Within that sport, there are factors involved that go beyond that single event. There are rankings, and those rankings effect the overall stats for each player throughout the year. There are team competitions, and historical stats in place and things like that aren't easily neglected.
Within competition, there are categories. There is no shame in separating a man and a woman in competition. Just as there is nothing wrong with separating handicapped players within their respective category. It gives more opportunity for growth within that level of playing field.
It is really very simple and very fundamental that the best within each group compete within each other. It is about organization and the reason we separate into categories is to keep things from getting too out of hand or the fact that it may add liability. There are a whole lot of other things to consider than to just ask, 'why?'
I personally think women can do very well in the U.S. Open. It would be a great accomplishment to see a female player win a world class event. There was a time when Annika, and Michelle Wie was allowed to play with the men, but think about it. They just don't belong in that group. The belong with other women in the LPGA. They compete among their own category. Within that category, there lies room for growth and that is what is most important is the future of that sport. I understand pool is different, and many female players can hang with the men, but that's not all there is to it.
Another thing to look at is who's club are you wanting to be a part of? Augusta National has a committee of men. They want their tournament to be males of certain qualification. To fit in that category that excludes others makes it all the more special. It also raises questions like the original question that started this thread. It is the same for Berry Behrman. He can invite whomever he wants no one can do a thing about it. If I have people over to my house, and your not invited, don't knock on my front door and ask why I didn't invite you, cause life doesn't work like that.
I am all for having a completely separate combined tournament for men, women, handicapped and whomever else wanted to get in providing they qualify, but I am a firm believer in tradition. Tradition carries weight and a sense of depth that is irreplaceable. We should respect tradition, and cherish it, cause once it's gone, it's gone.