There is such a thing as NPOA but most shooters don't know about it.
Have you ever shot good groups at targets but the groups are in different places on the target as you change positions or reload your gun or get distracted? If so,most likely it because of not having a NPOA.
Another thing about NPOA is the fact that most people relax their muscles when the trigger breaks and the gun moves. If you have NOPA,the gun stays where it was pointed when the trigger breaks.