The issue for me there is that I don't see the need to find stuff all over again using the FSS when you already have their pinpoint locations after a honk. To me it just makes little to no sense. Its not about rewards, credits or tags.Max, since You are an advocate of mutual exclusivity how would You see the system in which having equipped map charting module :
FSS is used only to plant a "discovered tag on a body".
FSS scan does not include any information nor does it provide credits or provides very limited amount of these.
Actual composition data, surface temp and all other advanced scan information is revealed only upon completing surface scan using probes.
Now having the BDS/IDS/ADS as an optional module that can work with the FSS in some way, but still keeping most of its functionality would be okay by me. I can live with that. I would just see it as an automatic mapping module upgrade to the FSS. But the better the unit, the more it wieghs and the more power it consumes. The ADS also shouldn't have a infinite range. But you can fly out to other stars, do a honk to get more planets/moons.
I would also add a functionality to the FSS, that when you hover over a found planet/moon without zooming, it will add a placeholder image to the system map . To get a close up you either have to zoom in or fly to the target yourself to do an auto scan. It will also have an unknown added to the nav computer.
Also add the signatures in the FSS to analysis mode so that when you honk you can have a good idea of what you want to do.
I think that would add more variety and more ways to explore and should mostly cover all the bases and they would all work reasonably well with the FSS.