The most important element of any strategy is change. Strategic thinking means thinking dynamically. Assumes that conditions and your competition will change.
Competition is a chess game.
Sun Tzu teaches us to think ten moves ahead. Assume that, if you become a competitive threat, competitors will adjust to you. What works for you initially will not keep working. Dynamic strategy means thinking about how the market and the competition will adjust to what you do. Sun Tzu's system forces you watch and study the competition every moment.