Well I've played this champion since S3. I didn't completely hate the rework, but I think it was less healthy for the game. This may sound weird since she'd have to be extremely fed to not need her passive to oneshot people usually. While the new ult increased skill cap (sort of), it also removed counter play. Like if she never ulted, she could avoid ganks with r no matter what her last spell was. Now lies the skill of what order should she use her spells and which she wants to be ulted.
How you used to beat leblanc before the rework was to try and survive laning and out scale. One way to do this was to keep her pushed in. (Probably was the best way) Because she wouldn't even be able to roam. This is why lbs started to max w for clear over q's 1v1 damage. But even that isn't enough to match waveclear monsters like malz, taly, morg, azir, etc. They removed that weakness when she was giving this passive. And I feel like it just made her early game MORE oppressive than it already was. Now this reverted lb seems to not be nearly as strong as she was before so that maybe something you don't get. One q w was extremely punishing in lane.
I like this clone far more because you can control it. You can fool people fairly well with it once you learn how to control it and can be helpful. It's something that you'll learn to expect when you get bursted. I didn't like the ult clone because it was easy to tell it was fake most of the time and I used it often because I'd r r when I wanted r q a lot. Plus that second of invisibility feels really good to have.
I will say that as I learned reworked Leblanc, she became far more fun than I thought she would. I still prefer old Leblanc though. The ult feels smoother to use (though I do think that is more necessary on old Leblanc because she's in and out instead of kiting). I almost wouldn't mind having both in the game. But I do loving 100-0 in a second far more than having to sit next to a full build adc for 1.5 seconds. I will always hate that delayed burst lol. And I hate that I'm pretty much a split pusher late with my great waveclear. mobility, and bs gunblade healing.
Sorry this was so long lol. I probably could even talk more about it. I think this is a topic people will always have mixed feelings because old/new leblanc had very different play styles. (Amazing with nearly the same kit lol) So people who like the diving trying to get picks over the kiting of teamfights will like old and vice versa.