Interestingly enough, I thought Chris' forehand became more of a liability (relatively speaking) as her career progressed. As you note above, she did have a very consistent swing, and this was especially true when she arrived on the tour. She might make an error, but she would adjust. As she got older, I thought her ability to adjust waned ever so slightly. Had I been playing her, I would have attacked her forehand relentlessy in hopes of breaking it down. One shot that rarely brokedown, however, was her forehand drop shot. It was the best drop shot in tennis, although Sanchez Vicario was a close second in my opinion.
I've been watching a lot of classic tennis on The Tennis Channel, and I'm amazed at the quality of stroke production in older players. It was superior to today's game in my opinion. Chris Evert's groundstrokes are even more superb than I remember -- and I remember them being downright great!