I agree, but it can be hell trying to switch your backswing style on the one hander, because the whole point of the backswing is to deliver you arm to the straight arm, hand by the hip' position.
Often, players have major difficulty changing their backswings because their new backswings don't deliver their arms to this position.
I suggest, (bottle rocket) changing/learning your backswing robert lansdorp style, which is to go straight to this position.You will be amazed that such a short backswnig results in absolutely no loss of power.
Usually people start from this backswing as beginners or learners, and over the years transition naturally to a slice takeback for disguise, but James Blake never did and the short preperation has given him posssibly the greatest backhand return of all time.
I'll post pics tomorrow.
I felt I needed to edit this and provide additional information. This is not a knock on your comments above (I agree with you) but wanted to clarify with the audience here.
If a player decides to take on tennis and develops poor stroke patterns that they have engrained, I do not feel sorry for them one bit. It is a coahces job to correct bad habits no matter how long or painful it will be to break the habits. It would be irresponsible of me to not have this frame of mind.
If a player wants to improve and they post videos signalling this, I will provide my most honest critique even though it will take months to relearn something. I would be doing them a disservice if I didn't.
A player who wants critique and has guts enough to post their videos, will get an honest and sometimes brutal critique of their stroke. I will never ever blow smoke and the first thing I will do is find out what is wrong with the stroke. I am a glass-half empty type of person and a player has to earn their favor with me if I coach them. Otherwise, they run and run.
I have grown tired of the coaches that blow-smoke with their players. Complimenting them on their ability to get to the ball when the player was late on every shot. I have never been and never will be like that. I believe some of football toughness should be transferred to the tennis courts and tennis coaching.
The long L and the shallow smile backswing are staples in the onehanded backhand. If a player can learn them fro pictures great! However, I will not confine them to one way to learn it. Everyone learns differently and if all a player needs is some pictures, more power to them.
I just do not want to limit their ability to absorb and have the "light bulb" turn on.
I have taught the onehanded backhand and have studied it for years. I will always teach the fundamentals over and over again with club players because I believe most players tend to get ahead of themselves. They get impatient and want to instantly hit like the pros when they have no business doing so.
The key to the onehander is to develop a simple, manageable, and repeatable stroke pattern that they can master. From there, they can add the "finesse" shots they need to improve their level of play.
Post the pics, but be open minded if they dont understand and need something else. There are plenty of drills available to drill the lessons home.