You have to separate what a chart stands for from what people try to do with it. A chart depicts what has taken place in the market. That is true. Now, people try to use charts to estimate probabilities of future events. But,
Since probability of an event and the certain event are not related at all (first thing your prof. will tell you in a probability course) it turns out that many get it wrong. It also turns out that the number of people that get it wrong is more than the Fibo number 0.618. Also, a good portion of those that get it right are squeezed out or play it wrong. The result is that about 90% - 95% are wrong about their final decision using charts.
Alex