Scathlocke's poor handling of character identity.
I can't help but feel that the lore retcons updates are just ways for certain people to inflict their vision upon the overall story of League. I can't help but notice champions are being forced into more confined molds, even outright changing their original intent or morality into some kind of skewed, gaudy facade. It isn't being true to the original champions and it isn't being true to the fans. Every time it's brought up on the boards, any kind of criticism is always met with "you're wrong, think like I do". It's almost as if certain folks working on these stories don't understand that it's actually possible to create a deep character without using generic narrative devices like wanting to do good, but taking it too far. Or the newly generic Darkin, now with less motivation and purpose than an old rubber band. Lissandra and the Frozen Watchers is another story I feel falls into this same trap. Once a clearly motivated and driven individual that, through cunning and perseverance, actively strives to reach her goals is now a completely different character. No longer quite the "bad guy" just as Kayle is no longer quite the "good guy". Probably the first example of the new generic narrative mold that we'll be seeing again and again.
Overall, I can't help but feel like those who actually care about the lore are completely ignored in favor of the writers wanting to imprint their own views, likes, and dislikes into the stories we used to like. That is, if they don't outright remove them, replacing them with heavy-handed motivations, boring character choices, and a severe lack of actual development.
An example of a story I think was done incredibly well was Brand's new lore. The new Kegan Rhode was so perfectly handled in the way he interacts with the world and with Ryze. His thoughts and emotions were simple, but that's what made him complex. His specific point of view allowed for unique concepts that, yes, while simple, were still compelling and interesting. It also added more than I thought we'd ever get to Ryze and his character. Even the act of taking Kegan as an apprentice shows he doesn't truly desire solitude. That maybe, eventually, someone capable could eventually take on the burden of collecting the world runes and not be tempted by their power. I can only wish that this is explored further.
I kind of wandered off topic there, but you get the idea.