I've played and seen a lot of baseball and 90% of the people I see throw a ball, do it at the equivalent of a 20 handicap golfer's swing. Perhaps, like me, you were somehow just a natural at baseball. Perhaps, like me, you played with a lot of guys who were also somehow just naturally good at it. Not that we all weren't taught and fine-tuned in the mechanics to be even better, but we had an innate talent/skill for the fundamentals. But, just like golfers, most people (in my experience, anyway) are very far from naturally good at throwing a ball and without learning proper mechanics simply swinging "effortlessly, naturally, free-flowing" or whatever, won't get them anywhere.