Firstly, you obviously made a good call today. Some of us, including me, took a loss. You could make the same decision tomorrow with the same set of circumstances and the exact opposite will happen. Mr. Market does what it wants and has little respect for the 2.30 candle high. The point I'm trying to make is that Net Trap has a good track record, this is why we bought it. So the chances are (we hope) that this will continue, and if it does continue to produce and we follow mechanically then we too will make plenty of pips. If you start introducing your own rules and judgment calls, you may well guess right some days, but you will guess wrong on other days and miss out on profits. Discretionary decisions can go either way. By all means, if you backtest a filter that proves over time would have consistently kept us out of loss trades then great, chance for you to either share it, sell it or keep to yourself.
Secondly, the appeal of NT for me is not just simplicity, but time. I don't have the time (nor the desire) to pour over charts. I have a tight schedule (except for today, have taken the morning off, officially sulking about the England result) another business to run and only few mins to look at the chart and place (or not place) an order. I just let it do what it's got to do. I then don't have any stress sweating over a position between 6.30 - 8.30am. Instead I'm either sweating at the gym or managing my other business, then it's a quick check at 8.30am and if still in the position then close it off. Simples.