Yeah I think this is the salient point that gets lost in the fog of war. After growing with hydroponics for long enough I now realise that a lot of the problems that people have are not to do with the actual problem but are more secondary problems, so I have come to the conclusion that even more important than the leaves is the root structure of the plant. Roots are the single most important part of the grow to concentrate on, get them right and everything else will pretty well fall into place, it's easier to get the roots right in hydro.
Once the roots are golden, then as you say defoliating it pretty well more a matter of 'well I don't need these leaves, are they doing harm?', and if the answer is 'yes', because they are blocking airflow, or light and they are superfluous for needs get rid of them. Another overlooked advantage to heavy defoliation is the ability to clearly see the structure of the plant and get a good plan in your mind as to what you want to do.