big difference between prediction vs. anticipation. It's a matter of probability, that's all... no one can predict.
I agree with you in a sense that DAY trading is kind of the same as coin tossing because of the reason you mentioned (esp. because of lighting-speed trading algorithm and given the fact that 80% of the trading today is done by these algorithm machine).

But back to swing trading and too illustrate the point. Let's take AAPL, please explain me why you think the support is tested 4 times at the same price... why is the downward trend line tested 3 times and then it broke upward including the 50-day moving average... a simple swing trader seeing that end of July could position itself by buying the SPX once the price reaches the moving average and put a stop 4/5 % lower in case it remains bearish. In the case of the graph, you would be in the money today. luck?

or another example, on SPX (SP5000 ETF). please explain me why you think the support is tested 4 times at the same price... then when it breached the resistance it went straight up?

This can be found in so many charts, and it is far from being just random luck.

But again TA is not for everyone, and we need people like you. You are the ones selling when we need to buy it and make profits.