So yea, if i would have been FDev and i guess at least from pro FSS side users as well, i can only imagine that they thought what i would have thought at that point - "Whats not to like about it, no need in keeping the old stuff".
Obviously I can only speak for myself...
You'll get a bunch of arguments for "What's not to like about it..." For example...
"I can't figure out the bindings or don't understand the HUD modes."
"It's difficult to use."
Neither of these are IMHO particularly valid or long lasting. They may be a knee jerk reaction.
Or perhaps, in not so many words
"I can't spot ELW's to cherry pick so easily."
But as you say (as have I), all the same info is there, it's just the presentation.
But for me, what is not to like about it is pretty simple.
It takes me out of my cockpit, and asks me to play a game that is entirely alien to the rest of the game. I've spent four and a bit years flying space ships and driving an SRV. All of that played through a HUD (and for the last year and a half in VR). Not to mention two decades worth of intermittent Frontier : Elite 2 game-play, also flying space ships. I recognize that E : D is not FE2 re-branded. And now, they are asking me to switch to a flat screen and match patterns. If I'd wanted such a game I'd have bought that, unfortunately for me I bought a game to fly space ships.
Anyway, that's my take on "What's not to like about it." I may well be the only person who feels this way, I'm not claiming anything else. I used the FSS in the beta, and I even used it a couple of times in live to locate USS's. Each time I liked it less and less, not because I didn't have it set up right or because I found it challenging. I zipped through the twenty or so USS's in the systems in probably a minute or less, but even that short time was not playing Elite : Dangerous for me.
I can avoid using it in the bubble, and I'm really not that overwhelmed with geysers, so I can keep playing, but exploring unfortunately is done for me.