Riot messed up Kayle/Morganna lore
The story of Kayle and Morganna before the rework was a pretty simple one. Kayle smited evil, but felt bad about it. Morganna sided with evil and was corrupted by it.They were pretty archetypal characters, so I figured the process of deleagueafying their lore upon the reworks would be a simple and easy process.
Apparently, I was wrong. There seems to be a need to complexify everything in the game on Riot's part, and it would appear the lore is no exception.
We didn't need to know who their parents were
What does having a god mother (not godmother) add to Kayle's and Morganna's narritive? She has no meaningful impact on the story, other than the fact that she's the source of their powers.
Their dad does nothing, imparts nothing to them, and has no real bearing on their life. He only exists to be killed by Kayle, so she can feel bad.
Their parents have so little impact on the overall story that I fail to see why they were included at all. You might as well have just had one sentence to reference them, and focused the rest of the tale on the siblings.
Kayle is no longer good
Old Kayle fought against evil for 10,000 years to keep her people safe, and promised 1000 years of service to the League in exchange for protecting her homeworld.
New Kayle is now apparently a blind zealous enforcer of the law, with jackass followers (to artificially spur conflict), who wound up going too far and gave up on humanity.
New Kayle is a quitter, but Old Kayle never gives up. Old Kayle sacrifices herself for her people, New Kayle murders them. Is this an improvement?
Morganna is no longer evil
Old Morganna felt that her people were overstepping their bounds and too tyrannical, so she made pacts with dark forces and at the last moment betrayed her sister.
New Morganna is an avenger, a protector of the downtrodden, and a... prison reformer? She also apparently hates her powers (you know, the thing that makes her awesome).
Morganna went from a fallen angel who made dark pacts for dark powers and betrayed her people, to some kind of dark avenger, who just kinda always had dark powers for "reasons".
Kayle and Morganna having god powers is stupid
So, you could argue that Kayle and Morganna being angel people from an angel dimension is kinda dumb. You'd be correct on that. Still it's cohesive, in the sense that they're winged people from a race of winged people, and it doesn't matter much for their overall story - that is, the thing that makes them unique is much more about who they are than what they are.
New Kayle and Morganna just kinda got god powers from the womb (placenta not doing it's job), and then spontaneously sprouted wings, which is just kinda okay with the other members of their tribe. Also they just kinda used their powers to achieve high positions within their societies with their own coteries of followers. Ok? But what would they be without their powers, just as members of their tribes, because by the lore their personalities themselves seem tied to their powers? We don't know, because they're just super-special-awesome people now because "lolz powers", kinda like superheroes!
Why tho?
It seems like every single character in the game now needs to be artificially tied to some nation or another to try and justify their existence in the world. Morganna and Kayle need to be winged people with magical powers, because that's what they are, and it seems like their lore was updated in this way to facilitate these two requirements.
What I don't get, is why this very awkward super-hero-origin-story means of explaining off the characters was necessary, and why you needed to dilute the archetypal good vs evil characters into a sort of bland law vs... generic caring for others? Why could Kayle just be good and Morganna evil? Seriously what's wrong with that? Even if you feel that's too cliche, why not just give them vague mythical backgrounds since they have been consigned to the myths of Demacia anyway?
Riot basically turned this https://imgur.com/a/abw8vz5
Into this https://i.imgur.com/apmsvCc.png