I was also TA agnostic but my views have diametrically changed because I realized it has a herding effect. It works because people believe it works. If RSI < 20 flashes a buy signal for hundreds of thousands of traders and algos, stock prices would unequivocally be affected. At the end of the day, investing is all about probabilities because no one can predict the future. TA won't magically reap you profits and it certainly has its flaws but it might just be enough to uptick the probaility of success by few percentage points. TAs can provide that 'slight edge' in beating the market which could turn out to be a winning strategy over the long haul.