Why do indicators play an important role in trading?

 You know, people often talk about price action, price action, price action in the stock market. Price action is fine in its place. But can we abandon the indicator? You should know that if a car is moving, when the indicator inside it goes below red, we know that the car has entered reserve. If that indicator were not there, would we know when the car entered reserve and when it stopped? There would be no alert for that. The indicator is a separate alert, a notification. What do you think? Let me know.