Quote from waterholicApplying some sort of rule-based standard will create a structure and force the person to face the truth.
This sounds to me to be at odds with a philosophy based on individual responsibility. Isn't the point that, in a purely material universe, there is no rule-based standard?
However the fact that there is no rule-based standard leaves open the possibility that one can create a rule-based standard for oneself, as long as they don't assume that it will necessarily apply to anyone else. That's part of the beauty of the world we live in!