My main combat ship has both fixed and turreted weapons, and I love both, despite one being very "manual" and the other being "automatic". Yes, I do very much like the FSS, but I would also find great pleasure in having an NPC crewmate who I can interact with and give exploration-related orders. Now the great irony is that my "let the NPC replace the ADS" was a compromise on my part, to extend an olive branch to "the other side", when in reality I agree with sleutelbos and others that NPCs should not be as good as humans at doing things (thus no "instascan" ADS replacement).
…
The thing is your proposal makes the whole reason for the FSS to exist obsolete. The FSS exists to make players do something to "discover" the objects in a system. Having an NPC that does that is the exact opposite of that. It makes the FSS pointless.
Whatever NPCs do with the FSS, the result is a completely scanned system down to the detailed surface scan - something the ADS never provided. It would be less player interaction - the only reason for the FSS - than the ADS.
There is no conceptual difference between pressing a button for X seconds to scan and pressing a button "to tell the NPC to scan". The result is in both cases that something got scanned without player interaction beyond pressing a button.
As I mentioned, I'm completely fine with NPCs using the FSS if there is the option to use the ADS. You can see this as an olive branch of compromise. Especially since using the ADS would result in less information gathered than using an NPC-FSS.
Are you willing to accept the return of the ADS if you get NPCs that use the FSS for you?
Edit: I think a good way to add NPCs to exploration would be to allow them to map objects. Higher ranked NPCs would be faster and require less probes. Resulting in a higher chance of getting the efficiency bonus.