Well I see your points, but if these methods are available, why not using them? Personally I don't find anyhting lazy about it. Beside even calculating it by yourself doesn't require any complexe math formulars... Unless your in the French aviation of course which are known for their particular method of calculating things in a more complex way than their anglo-saxon neighboors!
It's not the fault of the cadets, but of training department. The cadets just execute what they have been taught. They copy from all what the professional experienced pilots do which they fly with ,so this nonsenses should stop.
At least Easy is creating place for cadets... If not where should they go then? Oh I guess they should leave the places available for the people who have chosen first a different carreer path in aviation like instructing or TP? Well times changed.