Because imo whatever their physical make up is and however crazy their swing may seem their physical make up simply allows them more easily able to get the club head in the correct position required at point of contact on a consistent basis.
I do believe there are physical attributes which enable more success at golf. It's easier to have a powerful golf swing if you're not overweight. It's easier if you're flexible. It's easier if you're tall.
But I refuse to accept that the only people who can play golf at a high level are those who are skinny, flexible and tall. Inbee Park and Shanshan Feng would likely agree.
Here's the thing - golf is a timing game. It's my firm belief that people who are better athletes often succeed because they automatically lock in on the things which those of us who are less coordinated do not. They feel the effects of gravity on their swing. They realize the important of rhythm. And they often incorporate those crucial elements without ever thinking about them. Meanwhile, those of us who are less athletically inclined after 20 years of struggle suddenly discover the importance of rhythm and think, "Why didn't I realize that from day one?" Or they realize that to succeed you need to swing to a target, while those of us who struggle spend most of our golfing career trying to hit the ball.
I think through lots of athletics, the "natural athlete" develops a better sense of timing and rhythm. In a lot of cases, they only had to deal with the "can't break 100" club for a very short time. Their rhythm and timing learned through hockey, baseball or whatever quickly moved them into the 90's club and then the 80's club. Their athletic bodies also may make up for flaws in their game. They may hit a poor drive for example, but having the power to hit a 250-yard 3-wood can save the hole, where those of us who are not so athletic may not have that option.
So yes, it's easier. However, I refuse to believe that it will NEVER be possible for me to play as good golf as Canadan, Jeff Spicolli or Tadashi70. It's certainly more difficult, but I don't think it impossible. It also is not likely to happen, simply because I can't devote the time necessary to overcome my athletic deficiencies. But I do believe it *could* happen. I don't think anyone should look in the mirror and say, "90's is the limit for me because I just don't have "it""