This is a key point of difference between those who like the FSS and those who aren't so keen.
If searching for specific body types is what makes them interesting, then the waveform gives you what you want.
If that isn't what you find interesting, then you need to scan before you can find out if there is anything that warrants further investigation.
This is where I disagree. With the exception of certain types of rare unicorns, you can deduce the presence of most interesting things by using the FSS, without resolving a single body. There will be the rare false-positive, but IMO discovering a false-positive can be just as interesting, because it means that it's a rare orbital alignment.