Thinking about stellar phenomenon for example. When finding one, there's no indication of what it might be, we still need to go investigate. Why should planets be any different?
Because with stellar phenomena we know for a fact that SOMETHING is there, thus it gives us a reason to go and investigate.
FD's new proposed changes to the FSS would only give us vague probabilities, not knowledge, that something might be there.
That vagueness makes for a huge difference, and not a good one. Especially given the time needed to fly and probe JUST to see if anything of interest is really there. It would add a huge time wasting mechanic into exploration, and it simply does not need any more time wasting mechanics added to it.