Firstly i know i am not deluded , now thats out the way  😉 . Reading the talk about changing market condition making some systems redundant  has me thinking most systems here are NOT adapative . IN my opinion the biggest change in markets that throws static systems out of synch with market conditions is Volatility   . Having set  stops/profit targets etc etc , whether they be points or percent will always lose efficacy in radical changes in volatility  . If you want a system that stands the test of time you need volatility adjusted inputs and outputs  . Adapatable dynamic systems .   The key point i make here is that markets are dynamic and so should be your systems  . Just putting it out there  . Sure there are more things that change that affect system performance than volatility and we should also address these but Volatility is the major culprit  .  If you cant see the problem you will rarely find the solution