There's nothing keeping the world together in the problem.
Right now, Valoran is just a mess. Like, just a literal mess. There's no overlying power structure that binds them together to make a coherent and plausible story. It's just a mix-mesh of fetishes and cliches bundled together to a League (which was retconned) and a game (which it's story is now divorced from).
In WarHammer 40k, you have 20 primarchs (technically 18 since 2 are missing but blah blah) and each one has their one Jesus-like origin story where they rise up as some kind of savior to their people. Like, these stories range from ridiculous Khans to literally building intersellar empires to just a broody Batman to a choir boy who got touched too many times in the head.
Like seriously.
But what bound them together?
THE EMPEROR OF MANKIND.
And man, it makes sense.
The Emperor and the Imperium of Mankind was the glue that bound all these ridiculous concepts together. If we can tolerate a guy with a fetish for wolves working together with his best friends metal-slug-juice-hands and hawk-boy then we can accept Galactic Space Elves, Orks, CHAOS SPACE MARINES, and man- SPACE MARINES- COME ON. In any other context the idea of CHAOS SPACE MARINES sounds utterly ridiculous.
But in WarHammer it just makes sense.
Then there's WarCraft, where you have several factions all coming together on Azeroth. While there may not be such a unifying factor between, Blizzard has built up such a masterful history of interactions and characters and heroes for each faction. There aren't just one kind of Elf, there's Night Elves, Blood Elves, High Elves, and even among them are factions within factions. It's more believable, more interesting, and especially more fascinating because each of these groups have stand-out heroes: Sylvanas, Tyrande, Veressa, etc...
But without the Institute of War, the League lore lost that glue.
How the hell does a world with a pyromaniac schoolgirl and Rengar and HeimerDonger make any sense? How can they live on a continent where one city is a technological paradise and across the valley there's a bunch of over-industrialized wastes and beyond them are dudes still fighting with swords and spears?
What?
They've certainly don't have the vast lore and histories to back it up.
So it's just ridiculous.