I think if we want to learn, we need to be encouraged to be more careful about what we shoot.
I shot a great picture of my /2 one time, but the horizon was tilted. I have since learned to ensure the horizon is square. I shot pictures a couple weekends ago that were ever so slightly out of focus. I've gone back to learn how to focus more effectively. I shot a picture of the bridge and there was junk in the corner of the image. I've gone back to clean my camera. These screwups could have likely been fixed with photoshop in some fashion, but I think it defeats the purpose of this exercise, which is better composition and camera control skills.
If we rely on Photoshop as a crutch, I think it takes away from developing (so to speak) our skills.
That said, I will admit to running my photo of the bridge through Smugmug's color correction. I'm not proud of that. I learned, in that exercise, that a polarizing filter will be a good thing to own if I'm going to shoot through fog again.
I see these exercises as much like riding schools. You focus on a particular skill, trying to get it right. Along the way, I've learned other, very unintended lessons.
