Personally I think that there is something to be said about the importance of isoloation work for muscle groups like shoulders, low back, hamstrings, quads, chest. Not just from a development point of view but for balance and injury prevention. I know that Olympic athletes like gymnasts, weightlifters, throwers, etc. don't use isolation movements like these, but then again most of them are late teens to mid twenties and might not feel the same types of aches and pains as those of us who have been training for 10 years and are around the 30 and over mark.