I agree that Adams should not have retouched any of his art. I didn't like it when Marvel, in their reprints in days past, would alter lines of dialog to make the stories appear more modern.
As far as Perez's injury is concerned, I'm surprised that most artists done end up with carpal tunnel syndrome or some similar injury, given all the drawing they have to do on a given page. Here's hoping George recovers quickly.
Allen Smith