I like this post.
You correctly identify the issue with regard to the FSS (keeping in mind the obvious disclaimer it's your personal opinion which I happen to share, for other players the mileage may vary and all that jazz). For the ADS however, you're less specific. "It's stupid"
I think this might be the cause of you judging both systems in itself. Just the ADS, or just the FSS. Combine them and the issues you (we) have with the FSS, and you may even say the issue with the ADS is/are lessened. Not resolved, because your 2 would still be an issue.
Scanning systems with 45 bodies is a chore.Even worse if you just jumped from another system with a significant amount of bodies, "here we go again!". In the old system I looked forward to new systems, and the number of bodies couldn't be high enough. In the FSS I dread new systems. A big problem here (again, I will keep hammering on this, for me, this is my personal experience with the mechanism, reasonable people may disagree since game experiences are subjective) is we have no indication besides the inadequate FSS spectrum to get an idea what kind of system it is. If we were to have a general picture of a system, without any details per planet as you used to get in the way the old ADS worked, you could decide this system of 45 bodies was not worth your time, while another system with 45 bodies could be interesting enough to spend your time on.
The ADS is stupid. I agree in as much as the ADS being the end-all, without any follow-up is stupid. But having the ADS (system map) which you could use to base a decision on, is this system worth investigating, simply as a starting point, is not stupid. In fact, it makes perfect sense because it reveals the largest scale we're investigating: the system. It's a perfectly reasonable step 1. What kind of system are we in. Followed by the steps: what kind of planets are in this system and finally, what can we find on the surface of these planets.
The FSS doesn't bother with the: "what kind of system are we in" question, it goes straight to the planets question. And for clarity, when I say: what kind of system, I don't mean: one that has an ELW in it. In effect the FSS has flattened the exploration experience.
edit, edit, edit: for me!