Why (most) people complain about Sejuani's nerf.
A quick post for all those people who somehow think people on the boards are Lee Sin haters for whatever reason I can't understand.
The point is not that Sejuani is or isn't overpowered (I don't think she's overpowered, but it's OK for me if you think she is, and these nerfs will not affect her, they will just prevent FotM-players from playing her).
The point is not that Lee Sin is or isn't overpowered (I don't think he's overpowered either, still he has a very toxic kit, but that's another topic).
The point is that Sejuani has been nerfed as fast as she became strong (literally, the patch was last Thursday), meanwhile, people has been complaining about Lee Sin: he has no exploitable weaknesses, he can compete decently at every situation, he was too strong compared to other junglers a month ago, he has awkwardly high base stats), and RIOT has pretended that nothing happened.
Champions like Rengar or Xerath has been reworked for similar reasons that Lee Sin (they were not OP, but their kit was toxic because X). And, in fact, RIOT wanted to rework Lee Sin and, guess what? When people complained, they reverted his rework in a "ok, ok, I won't touch this, please don't kill me" mood. But they didn't care about Cassio mains (for example) when they complained about her rework.
AND BEFORE SOMEONE COMES HERE TELLING THAT LEE SIN'S KIT IS OK AND RIOT DOESN'T THINK HE'S A PROBLEM: Just look at this.
"I love his kit. I hate his raw power. He's only "balanced" because insanity like Elise and Vi exist." "Actually, when we nerf Lee, it causes a HUGE uproar. If I wasn't worried about what people thought we'd nerf him months ago"
These things have been said by Morello, not by a random RIOTER from another department.
tl;dr: The point is that people is sick of seeing some champions being insta-nerfed while other champions are blatantly ignored even if their issues are similar.