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...
Peace of mind directly depends on how accurately you adhere to the risk management strategy. You cannot be calm if you have a high leverage order open for your entire deposit and at the same time the price is moving in the opposite direction to your expectations.