Not a perfect world, brother. Maybe not right to assume that a single candle indicates change of sentiment. Confirmation is always needed from the following candles. The indicators just make it easier.
Of all the posts in this thread , no where has it been said that don't use indicators.
The only advise is not to heavily rely on indicators and focus on price action also.
I have seen a lot of traders start using indicators,then get into optimization and then into spotting divergence,etc,etc and when they get nothing from it they get into another indicator and the search continues.
Also price action takes into account supports and resistance also,not single candle in isolation.That is why chart patterns and candlestick patterns also should not be studies in isolation but at important support and resistances.
The same applies to indicators.People use indicators designed for EOD basis on the smallest of timeframes ,viz 1 minute and expect the same results.
Usually, traders just randomly pick an indicator, place it on their charts and then try to make use of it without really understanding what they are looking at.
How wise is that ?
Therefore, the debate whether indicator based trading is superior over price action based trading is redundant.
A trader may use whatever is comfortable to him and his risk appetite.
Traders always look for reasons why a trade turned out to be a losing trade. In quest of answers, they arbitrarily alter indicator settings, add new indicators or seek for answers elsewhere until they have found a possible explanation why their signal was “not correct”. It is important to understand that you will always be able to find reasons why a trade did not work out if you just play around with indicators long enough.
A broad classification of the indicators and their use,I doubt whether those people who use them excluding senior and professional traders ever know their use and in which context.(read "trending or sideways markets").
Good article for using indicators effectively.
http://www.investopedia.com/articles/trading/12/using-trading-indicators-effectively.asp
Bottom Line: If you are randomly selecting indicators to support your analysis, you will more than likely fall into the multicollinearity trap of using multiple indicators that are all saying the same thing. They are not giving you any additional information; in fact, they are restricting your overall view of the market. Don't search for supporting information among collinear indicators, it is just misleading.