There is only 2 ways to teach girls, but most choose to teach number 2.
1. Is the right way that uses the entire body, good safe body mechanics and gives the best possible results. Bigger harder hits and more consistant hitting. Also this is true for throwing in which results that give farther faster and more accurate throws. These require more work and practice, a strong focus on mechanics and takes a much longer time to get the top best possible results. Plus some just can not get it, ie bad motor skills.
2. Is the way that is taught fast and quick with very good results in the fastest easiest time possible with very little effort. Why is this the number one choice, because most girls do not want to work and pracitice over and over to see slow improvements over an extended period of time,. They and the parents want the quick fix, the improvement right now. Other reason is because of how we have allowed things to evolve, with one year commitments. Coaches have the players for one year so it has become in theirs and the teams best interest for the quick fix to achieve good decient results..
I too have had to teach number 2 last year. The girl on my team was a very good outfielder her throwing mechanics improved alot, not great but a huge improvement. Her hitting on the other hand she just could not get. In the first 2 tournaments she had 14 stirkeouts no hits and 3 groundouts. She was pretty fast and I had her chokeup on the bat and do a quick half swing at the ball as to slap bunt as a right hand hitter. She struckout 6 times the rest of the year and her batting average eneded up at .385, take away the first 2 tournaments her batting average would of been .520.
So it was taught to her because it was the easiest, fastest, required the least amount of effort on her part, got her confidence up, and helped her team in the best possible way for that one year moment... Will it be good for her in the long run, no, but it was for just that one year.