The discovery scanner should provide a complete list of items (body types, biology types, interesting features) in a system, and the Full Spectrum System Scanner and Detailed Surface Scanner should be solely for locating already identified items, and maybe providing a few more minor details. The FSS is far too fiddly to be using as our primary discovery tool and should only be mandatory for actually locating things once we've determined via the Discovery Scanner that the system is worth spending time on.
Entering the FSS Scanner Screen (without taking any further action to resolve signals) already provides lots of info, certainly enough for the player to make a meaningful decision on whether a system is worth investigating further. A simple example would be whether a system contains an earth-like or not.
This is an analogous level of detail to the old ADS, just a different slice of the data. I agree the FSS Scanner Screen 'fiddly' but it's still way, way easier to make the second decision of whether a specific body is worth further exploration than it was with the ADS, and without travelling to the body there is still a great deal of detail that can be gleaned from resolving a signature, definitely enough to make a meaningful decision on whether to take the time to travel to it or not (eg to map a terraformable or landable planet with bio/geo etc).
The exact detail of what bio will be on the planet, or what mining hotspots will be in a planetary ring is not available without travelling closer & using the DSS but I'd say that's fair enough, it's still easy enough to make educated guesses based on the info that is available from that initial system scan (ie an icy ring might have a tritium hotspot but won't have a platinum one, or that a body of a certain size, temp & atmo type will probably have something interesting and/or valuable to scan).
I think the current steps towards obtaining full detail are easy enough (and significantly less time consuming than before the 3.3 Beyond changes) so I'm not looking for it to be even faster to find out all the goodies a system has to offer but then there's plenty of systems out there so I don't really see how it would do much harm to make it even quicker than it already is

I suppose it would reduce the likelihood of discovering unexpected stuff
Maybe adding a specific module for miners to give detailed ring/asteroid cluster info at the FSS stage of discovery, and one for exobio too maybe. Takes up an optional slot, isn't compulsory but allows a ship to specialise on what the player is looking for?