Thanks Dave. I agree completely. The point was that such flies are needed now days in heavily fished waters with catch and release. Fish that get caught a number of times during their life tend to become more and more selective.
As George Grant once said, in talking about the old times on the famous Western Rivers, "In those days, it would be hard to find a fly which wouldn't catch trout". I am paraphrasing, but it was pretty much accurate......................