actually sometimes false demand is created for some coins to make huge profits.There are always some big players who can manipulate prices
Thats why one need to have good skills in trading or bitcoin investment because at times those big players can make a very huge impact on the market through manipulation just to give them the opportunity to make huge profit. Hence, it is necessary to have good knowledge on indicators and strategies for safer trading before you go into it.
You are right, even they are lots of strategies and indicators are available for trading purpose, having one or two tools are will be more than enough for helping us to determine any sudden market changes. I do hear candlestick chart patterns are very good to predict market changes well in advance.