While I might agree to your postulate on how peace of mind can help traders, I consider it under a broader scope as skill rather than an actual strategy. Peace of mind is something you can attain mastery over by learning some calm in either yoga and some monk activities.

You could however transfer these to trading, by learning how to be calm even in some bad situations where the market tends to go against you but, your confident in your analysts for a change in direction. The only way you could get that is, if you’re 100% trusting on your analysis.

Long term trading (swing traders) consider analysis on a broader scope, having to put together several averages and doesn’t give room for any significant variation without a significant event that could bring about this variation.