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They cannot predict the future. There is always something that isn't predictable.
Obviously.
You could use that knowledge of pattern recognition coupled with access to information to make informed predictions. But, I suck at it.
Because that isn't it. What you build a strategy according to the signals you get from the TA tools, and you decide what you are going to do (long or short) depending on what happens next, and you do it and then update the strategy.