@Riot Narrative. I Give Up. Please Explain Your Narrative Direction Comprehensively!

How does Runeterra work post retcon? How do different factions interact?

How does the removal of summoner's and the Institute of War affect things?

Whoes lore has been butchered?

Whoes lore will remain the same...and will it still make sense?

Riot please, what is going on between the different factions of Runeterra right now?