The purpose is not to have a method that works 100% of the time, experienced traders call that the "Holy Grail". That method may exist, but nobody seems to know where it is... lol. The idea I use is to trade only the best setups and be aware of things like news, psychologic price levels, major news events and economic events. My profit/loss ratio per trade is usually above 70%, at that rate you can lose sometimes and still come out ahead at the end of the week. I could have told you last friday that this current week was going to be hard to trade. My own strategy was not to trade until thursday. I traded all week, basically losing previous profits until thursday and then gaining back some of the profits lost. I'm up 10% for 2 weeks now, so trading a week like this is not profitable in my opinion. (Note to myself.) Not trading a flat 50 ema on the 15m chart will help eliminate losses as well. Try judging this system based on if you go into profit within 1 hour after the entry. Closing the trade is up to you, not part of the system I am sharing. There is no set exit method as part of the Simple 7 trading strategy.
Price oscillators are extremely relative, not at all subjective (I do not prefer them or use them anymore.) RSI is realtime, it is basically a momentum strength meter. (I like it.)