Sun Tzu's aphorisms are distilled commonsense, and nothing else. They need to be seen in the context amongst which they were formed. Nelson was a successful strategist but no one is saying - as far as I know - the the RN adopt Nelsonian tactics today.
Don't get me wrong; I am a keen historian, have published a few papers and given a number of lectures on military history. But that's not the same as slavish adherence to dogma.