I agree with you and I'll follow the advice but my experience using my imagination is that I have drawn things that are not much relevant to my brain, for instance, drawing glass is not drawings glass at all but drawing reflections, is it understandable?, if you draw a reflection your brain build the rest.
I think that is also important to understand how brain works to save effort, actually everything is a matter of lights and shadings, aren't they?.
Since I started to draw I'm really obsessed with lights and shadows, I do agree with you, when you see a drawing that every shade or light is consistent you feel it in your soul, I've tried to understand how it works but I failed more than once that's the reason I ussually copy instead of creating.
I'll have a go at your proposal I am sure my knowledge will improve in some way.
Best regards.