many trading techniques that do not use indicators and utilize price action, use indicators have strengths and weaknesses also that sometimes there are many cases of repainting and slow motion to order but it depends on the position of each trader what techniques are used when you want to trade and I don't think that you get good results without using a few indicators, it's necessary if you want to be sure of the direction of your trend line and to know oversold and overbaugth. don't build your ideas just by looking at trend lines or on charts you have to use indicators.