Hello Frederick,
Thanks for the link. However, I believe you are severely misguided when you wrote “Personally, I have no use for trend lines, and he used them in his book but concluded at the end that he would have to rethink his use of them. His conclusion affirmed my own.”
Let me explain, one of the forefront and most important principles in technical analysis is that prices move in trends. As authors such as John Murphy, Martin Pring, Edwards and Magee, would all collectively agree that the concept of a trend is a core component of the technical analysis foundation. While one could argue there are multiple methods to evaluating a trend, such as moving averages, running linear least squares regression, and other methods. Trendlines, are without a doubt, the most efficient way of understanding the trend. I would be very skeptical of anyone who thinks otherwise or can agree with your assertion, as it directly violates, one of the three, fundamental building blocks in which TA is based upon: prices move in trends (Murphy).