I'm sure that is why the OP's comments contained this line: Take a few minutes to look around at any driving range, and you'll see plenty of people (probably the majority) that allow their left arms to bend 30, 45, or even 90 degrees on the backswing. These are probably the poor souls the OP was referring to. The last thing they need in their head is a swing thought that says "don't keep you arm too straight." That's just going to reinforce their excessive arm bending.
6/30/10 at 2:12pm