TLDR
"They can't do it because of the methods and how in-depth they're trying to be. Pre-retcon Runeterra was an idea that popped up and they kept tossing things into it as it randomly appears. Post ret-con Runeterra is trying to assimilate 4 years of past lore, go further in-depth, edit, mend, and overall make better what they think was a lower-quality story. That takes time."
NOT TLDR;
Riot is a GAMING company. Because of this, they focus mostly on the game itself. They try to make sure that the champion's play smoothly. Do their kits work? Is it fun to play? Does the character's VO and look fits the theme that we're aiming for?
They are a video game company. They are NOT a story telling company who publishes works of fiction every 2 weeks (oh, JoJ, is that you?)
Pre-retcon Runeterra was at the start of League's founding. THey were that "indie company" that you mentioned before. That indie company said, "Oh, this world sounds like fun" and threw into it a bunch of cool things they thought would work and be fantastic! The JoJ! Blitzcrank's Dating Services. The Institute of War and Summoners.
This was when they were an Indie company. Now they're a large multi-national company, and they said, "We need to make higher quality lore." Which, they don't need to. Because it is a game. Most mobas don't have a lore. And any bit of lore they do have isn't meant for world building. It's meant to explain "Why are they here fighting." You know, like pre-retcon.
Sure, sure. They ruined what was there. And yes, I'm sure they had plenty of time to fix it. But at that time between pre-retcon and 'We're retconning', they were trying to figure out "How do we want this? Where should we go with this? Is this a good idea? How do we present this to the lore community?"
Did they rewrite Kalamanda yet?
No.
Do they intend to?
Yes.
When will they?
When they're able to reach that point in the story.
They are trying to go more in depth than what the pre-retcon lore has done. That takes time, proper planning, and execution. It's one thing if you're writing stories for "in the moment" responses to what was placed there a day or so ago. Hell, if it was as easy as that, anybody who knows how to roleplay as a character with semi-correct grammar can do it. It's a whole new monster when you're trying to make an actual chapter--a plot--then figure out where on the time line it should go, and what should all happen between it. And if someone else has an idea of an inbetween, would it change the situation? What kind of context does that whole idea prior find itself in. The Freljord is in the midst of a civil war. Okay. Pre-retcon could do that (and let's just not mention the summoners because of the same old stupid excuse against them everyone make). Pre-retcon would just say "Hey, they're fighting. This is why they fight. GG WP, let's make this story."
Post-retcon does the Civil War, what happens after the end (when they're able to reach that part), why Demacia and Noxus doesn't care to help. What kind of shifty going ons is HAPPENING that would cause us to see one of them to bother lending their "assistance". Oh, and the best part, what is EVERY INDIVIDUAL FRELJORDIAN CHAMPION is doing in-between the fighting, and I mean in more defined context then, "Tryndamere is stuck shopping for heels with Ashe." (and yes, I know that's unlikely, but you get my point.)
The Narrative department is actively at work trying to figure out how everything can be cohesive without any breaks and plotholes in the stories to come. Some of them will be gritty and grimdark. Some will be light-hearted and jolly. Some will be in-between. But if all we do is focus on the negativity of "Why is all the lore not here yet" then we will be disappointed and upset no matter what Riot does or hand to us.
Because yes. They have old lore to re-write and show us.
But they also have new lore they are trying to make.
Along with the revision of a 100+ champ roster.
And stories that need to make sure that the addition of a new champ joining the game doesn't completely bust it wide open.
