To give you an idea of standard practice, it is always to select idle reverse. Second detent I have not used in years. Full reverse- not at all on the 737. Reverse power is not very effective, and VERY noisy. It is also very bad for the engine, ingesting debris off the ground, shaking it badly and wearing the translation mechanism
One presumes you have written to the aircraft manufacturer of your opinions on the use of reverse thrust and recommended to Boeing they change their procedures? Certainly it contradicts the recommendations contained in the flight crew training manual. If you care to compare the effect of reverse thrust when correctly applied, to the stopping distance on a wet, slippery, or contaminated runway versus that of a dry runway you will see a significant benefit.