Has Riot ever reverted a rework? Will they ever?

Just using these characters as an example. I do understand that time and resources are poured into character reworks and once it goes live, you cant really revert it because people started to spend money on said rework, the same can be said about people who enjoyed the champion before the rework and spent money on it.

for example is basically a new champion entirely. Riot's reasoning for Aatrox being like old Aatrox is because he has a built-in revive. Though I thought the most iconic feature about Aatrox was that he can swap between more damage or sustain, something that other characters did not have. He was also a very autoattack based champion, but now hes more like Riven. His personality is completely different from his older version, going from a cool character that loves battle to a screaming edgelord that loves to kill people.

A bit of a "bully" type of champion in a similar way to ends up being reworked into a duo laner with an ability to revive Dragon because "Dude what if you could revive the dragon!?"

I find a lot of people who enjoyed playing Shen kind of stopped playing him since this rework. Its a bit odd in general. I do not have a lot to say about Shen as I haven't played him much since his rework. I enjoyed him before it, but he has definately dropped off my list of characters to play. I often hear people don't like new Shen so I figured I would just mention him here.

Zac was probably higher up on my list of characters I played, before the rework of course. I don't really understand why he got one in the first place, he always seemed to be "Just right" in terms of balance. What I have heard by lurking in the boards was that he got changed for being kind of boring? His Q just being a skillshot slow and something about his ultimate not being exciting enough? Is it really a crime to have a character that is a bit simple like that?

I really don't get this one either. Everything I have to say about her is basically the same as

Just to be clear, this thread isn't intending to completely bitch about reworks, but its more so if Riot will ever actually reverse some of the bigger changes they make to characters, such as a completely new ability or even a rework.

Is it at all possible that Riot will revert someone like back to their previous identity and just fix it up a bit? Even making the new version a separate character entirely? (I do hear that before the rework, he had received a buff that served him really well).