Chart or technical analysis can be useful because there are pattern and some information from the chart but it can't be 100 %, if it can be accurate 100% all the exchanger can go bankrupt, but with technical analysis and chart you can increase your profit chance
Not a chance, technical analysis is objective! So that one trader might be seeing that a cup is half filled, while another is seeing things from the point of view that the cup is half empty, at the end of the day, their inference would differ on account of their dispositions, nevertheless, they converge along the line.
I must add here that T.A. are to a trader, what navigation aids are to pilots. Certainly, it won't be the one to fly the plane, its role is simply to guide, while you sit at control.