....
Another big plus for ND is negative returns. You know you DON'T need to fly across the system to check if anything is orbiting the outer jump point or a distant gate or a big asteroid belt etc.
....
Exactly. It saves really much time. I know in few seconds if a system is empty. This saves time and supplies. Especially if the system is full of asteroids or nebula. The Detectors range is not reduced by those.
I have definitely found things that were not near landmarks as well. Particularly systems with large asteroid belts tend to have stuff like mining stations randomly in the belt in places you would not reasonably look otherwise. I would not say domain colony items from stations are 'crumbs', and I have found stuff like that on occasion that I would have missed. Also, domain era stuff can spawn randomly out on the edge of the system, far enough away that you would not find it otherwise. I have found survey ships that way before.
Exactly. The mining stations contain Catalytic Cores, Synchroton Cores and Pristine Nanoforges and are mostly in some belts. Or let me tell that in another way. Some People in this forum complain about often not having all of these items. I never had a playthrough were i did not have all of these at least once.