The problem with trendlines is the same problem that you can have with any charting indicator. All chart indicators are lagging none of them are leading. They only confirm what has already happened, not what will happen next. An indicator may suggest a potential momentum or possible support and resistance, but the fact is is anything can happen next regardless of what the inidcator is indicating.
To clarify, I'm not saying I dont use indicators at all. I do use them. Im just saying they are suggestive at best.
An indicator may suggest a potential momentum or possible support and resistance, but the fact is is anything can happen next regardless of what the inidcator is indicating.