Let's be honest: Lee Sin isn't reworked/nerfed like he should have been years ago simply because he has the highest amount of fans of any champion.
Riot didn't give a crap when they reworked Kassadin, or Skarner, or Karma, or Cass, or Yi, or...
well you get the idea.
But when it's Lee Sin's turn to get changed from his ridiculous state, all the sudden it's "oh there were a bunch of well-reasoned arguments", aka the chinese scene complained and the Lee Sin mains couldn't handle their favorite child finally being brought into line with every other champion in the game.
At least the attackspeed nerf did a lot about Zed's backdooring and dueling potential (which is what made him op, not just being an assassin).
No matter how you look at it, Riot's playing favorites with Lee Sin. Any of the reasons he's not getting changed just go back to this fact.
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He's been complained about for years and been a (if not the) top jungler for years, without significant nerfing or reworking. Can't say that about any other champion in the game.
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He's the only champion whose gotten their rework cancelled once it was viewable by the public. Again, can't say that about any other champion. Think about that: The champion with the highest play rate in the game also happens to be the only one to not get reworked despite the outcry of his players... hmmm....
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Riot has said he's problematic (Gee, you think?) more than once, over this several year period, yet sees fit to ignore him while every other jungler gets nerfed around him.
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Riot claims at each jungle rework and set of jungler nerfs (hello, repeated stripping of Kha'zix) that they're trying to "open up jungler diversity". Unless that means hurting their favorite child by actually knocking him down a peg. They're fine nerfing every other top tier jungler, sometimes in groups, except for Lee Sin
I don't think Riot refuses to nerf him for pure money reasons, I think they refuse to nerf him because either
A) they just have a massive boner for him, which would make sense with this level of obsession (see: Big Plays spotlight being almost exclusively the same champion),
B) They want views on their events
C) They (the most sad one to think about) legitimately are just so out of touch with game state that they actually deluded themselves into thinking he's fine how he is, or
D) can't deal with the backlash (apparently it's fine to give the finger to small groups of dedicated champion fans, but not your big views-bringer, eh guys?)
E) The balance and design teams are (relatively) small, at this point I really wouldn't be surprised at all if the people on those teams actually are constantly postponing or shooting down changes to Lee Sin just because they personally like him. I have a lot of respect for Riot as a company, believe it or not, but stuff like this really hammers in the thought sometimes that "wow, maybe these guys really are just jerks with favored picks".
Seriously. Lee Sin is NOT a new balance topic. He's had the same overloaded, overtuned kit for 3 years, had the same complaints from the junglers who aren't obsessed with his "plays" for that entire time, had the same PR bullshit responses of "we'll get to him after this jungle rework" or "we're 'assessing' him", yada yada yada QQ QQ. It's not a new issue. It's just one Riot actively avoids because he's popular, whether they'll admit it to themselves or not.
You guys play favorites with this champion. End of story.