We have to adapt continiously to the changing environment in which we fly.
Sometimes we have to adapt our strategy according to what the environment has in store for us.
Certain rules should by all means be "cemented in stone". (e.g. GPWS hard warnings at night or in IMC, all PULL UP warnings, stabilised final approach by 1000 ft IMC or latest 500 ft VMC, landing within the TDZ and so on and so forth).
But others are just recommendations allowing us to adapt our stategy accordingly and within the envelope and safety margins of our SOP's