Trend following, simplicity and robustness

"We have a saying here: "It is incredible how rich you can get by not being perfect." We are not looking for the optimum method; we are looking for the hardiest method. Anyone can sit down and devise a perfect system for the past." - Larry Hite

As a trend follower, it is important to acknowledge and accept that individual stocks making up the 'stock market' are in a constant state of change themselves, be it trending or non-trending, and all with differing levels of volatility, as well as the indices themselves, along with foreign exchange, interest rates, commodities etc.