Not sure why you can't conceive of this - it's how the game worked for 4 years prior to the FSS.
The ADS detected bodies but didn't tell you what they were - Unknown - the most common word on the explorer's UI since the game started.
Seems pointless to me. Let's think about how this would actually have to work to be viable...
You honk, it tells you there are X Bodies in the system. You get 0 credits for this.
Your system map is populated by blank spheres you cannot select, as you have to actually scan them with the FSS.
Your list is populated by X "Unknown" bodies, you also can't select, as you don't even know where they are, just that they are.
Signal sources are not revealed, as that's the role of the FSS.
So what did you get for your efforts? A noise and a number.
Guess what, the Discover Scanner that's built into your ship already does exactly that, save the list of unselectable unknowns - because you don't deserve an advantage over anyone. You don't get to see or hear anything on the system map, for the same reasons.
So what's the point of it? Pretty sure Frontier had this same discussion. They also saw it as pointless, didn't like it in the first place, and gave us something they do.
Just so happens, I like it too. It's pretty close to what I've been asking for for over 3 years, and others even longer.
But let's flip the script here a bit and talk about a change that was made without consulting me, that I don't particularly like:
Engineering
But wait, because this isn't quite what you're expecting. I also asked for several years that our Engineers be given brains and not to make a Grade 4 "upgrade" turn out worse than the Grade 1 upgrade I started with, and they did. I suggested a progressive system, where each improvement was actually an improvement over the previous upgrade, and it is - sometimes less than 0.1%, but it's still an improvement.
But where they copulated it all up was - Making the Engineers all suffer from Anterograde amnesia. "What are you talking about Broo? You just made a Grade 5 Cannon Upgrade! What do you mean you have to start over again? It's the exact same kind of cannon!" Yes, I'm talking about the Every Upgrade From Grade 1 trash. Absolute, utter garbage. But you don't see me starting and perpetuating 400 page threads about making the old Engineering systems coexist with the new ones. I'm not rage-quitting, inciting riots, or even pouting about this change to MY game play. I can't be convinced it's not asinine, and honestly I've never heard anyone say anything to the contrary, but I don't like it. I admit it openly and freely. I've suggested changes - like allowing us to upgrade all of a matching system (aka all your miniguns/cannons/beam lasers/HRPs/Whatever) at the same time, with the same effect, even an an increased cost (cumulative cost +1 would be fair), just to not have to sit there and upgrade and upgrade and upgrade and upgrade and upgrade and upgrade and upgrade and upgrade and... I think you get the point (my last G5 mod took 27 upgrades to max out), and then do it all over again for port side cannon.
But Buttercup, I sucked it up. I live with it. If they improve it later on because they see the light and realize "That doesn't make sense", then great. If they take the British way and say "But we like to suffer..." then that's fine too. It's their game, it's their prerogative. I'm just here to fly pretend space ships and seed the galaxy with my quirky sense of dark humor.