>>715849231Because Seraphine was riot's biggest Mary Sue the game had seen since Kaisa. They thought that any negative controversy about her would result in less people forming parasocial relationships with a fictional character, so as soon as the backlash against her started Riot had to scrub it all away. The irony is keeping that plot point would have resulted in an actual palatable character but hey, gotta keep waifufags happy since they buy the most skins. Even still the controversy stuck with the playerbase which doomed Skarner to win the rework poll and, well, we saw how that turned out.
And yeah, Arcane had to ignore him because I doubt any of the animators on that show could find a way to incorporate him. Even still there were a million better ways they could have continued Skarner's lore that weren't just sticking him in WakandaIxtal with the shittiest lore ever.