In my opinion, the game has a technical debt and design problems that were there since the first Warhammer Total War. The third game is very ambitious, but the engine it runs on was never meant to tackle this. Immortal Empires campaign is the result. They began to operate on a true grand strategy scale in IE but their engine doesn't deal well with hundreds and hundreds of factions and while the map is beautiful, they had to squish it very weirdly in many places in the name of performance. It's the biggest Total War map that's at the same time, gameplay wise, too small.