I think in my own case, stop orders that wouldn't cost profits is almost impossible because of the following factors:
1. the mkt has entered a deep bottom which is akin to 'holding a ballon underwater'
2. You can sell if the position declined 10% but then you have a burden of deciding when to re-enter the same position.
3. I've have various people email me ema crossover idea but when you crunch them into the data base what you end up with is
4. You sold and then it reversed and the ema got you in higher than what you originally paid. So all you have accomplished is costing yourself points by trying to save some.
But, a lot of this only applies to major bottoms as tracked by vix and pcr multi day spikes, surges in net new lows yadda yadda. Not to many other situations where it might make far more sense.