The "gray bodies on the system map" bug in a beta was way before the Beyond season, before there was any talk of changing exploration gameplay. A small minority of people liked the bug and lobbied FD to keep it as a feature, but when Michael Brookes or Sandro Sammarco (can't remember which) said that he's leaning towards doing that, a lot of folks were upset and there was quite an uproar. Thankfully, he changed his mind.
Now, when FD revealed how the FSS is going to work, plenty of people suggested that this would be returned. After all, now we'd have the information on the FSS barcode to go with, so in this case, it would actually have been an improvement. Frontier ignored this suggestion too, of course.
I don't remember this appearing in any of the Beyond Chapter Four open betas though.
As for
@Old Duck : as far as I know, it wasn't the lead designer who designed the FSS (there is no such position as "lead developer" on Elite). Mr. Sammarco who was just leaving back then just set some guidelines for doing something other than the ADS. The FSS was designed and implemented by someone else, and okayed by then-lead designer Adam Bourke-Waite. He doubled down on things after all the negative feedback... but if it was personal, then that shouldn't be an issue either, as he's no longer with Frontier.
As I've said plenty of times before, Frontier could do better than either the ADS or the FSS. While some fans seem to think that you have to like and defend the FSS, the truth is that it has plenty of issues which need fixing, and that's regardless of what came before it.
Sure, you could slap a bandaid on it by putting the ADS back in as an optional / exclusive module, or with gray bodies on the system map, but neither would solve everything. At the end of the day, the current exploration core gameplay loop would need a careful and thorough redesign and reimplementation, and not the rushed and sloppy update we got in Chapter Four.
Well, that's assuming Frontier cared about improving exploration, of course. Personally, I think the only thing keeping it going is Elite being the only game with a realistic 1:1 scale recreation of our galaxy. As long as Frontier doesn't thoroughly mess exploring that up, and as long as there's no competition there, there will still be some players exploring.