This picture says it loud and clear. The Lore nowadays seems to be in a state where a newcomer starts super-relevant when debuting, but then quickly forgotten about when they are about to be only the third newest character.
I'm pretty sure part of the playerbase that still cares about lore is getting sick of every new champion in lore essentially being one-use fire-and-forget character. They want new character to stick around in a lore for longer, not put on a bus after literally one-two new champion debuts! Atlas is perhaps the most egregious example: He was put on out-of-lore bus the moment Io was introduced! And Io was introduced into the game right after him!
C'mon, It's becoming a chore when you first introduce new champions like they are a new big deal, and then throw them away to make way for the second-next one! And what about champions who already stuck around here for a while? I mean, Koga, Jenos, Khan? Tyra, Sha Lin, Strix, Inara? Cassie, Barik, Fernando, Androxus, Ying, for the last but not least?