Were they played by anyone and everyone? To the point where it's all just Chaos vs. Chaos matches because nobody has even a hint of creative difference within them to play a different race? Because that's more what I was referring to in my comment about SM/Stormcast, and in my experience there wasn't an overwhelming majority of people playing Empire.
As for the Stormcast themselves, I personally don't care about how they're progressively turning into edgelords. That piece of fluff is only going to matter when it has an actual payoff, and to me that's either going to be through a massive schism in the Stormcast Eternals or from some falling to Chaos/an opposite faction/whatever. Leaving it on, "I feel dead inside" is just moot; it's like wiping out an entire army only to say that the terrible weakness you hide is that you can't read.
Josh Reynolds is a good writer, and I think part of the benefit of Soul Wars is that it imposed more order on AoS. The base product was very free-range with its story, but Soul Wars gave more identifiable dimensions so that it felt like you were playing within an established story rather than being in a giant sandbox. Fantasy benefitted from those restrictions too - you knew what the race you were picking up was like, all their major battles, where they came from and their general goals. I just hope that in time the setting maintains it's from and uncompromising nature, and doesn't turn into something that gets a Saturday morning cartoon to accompany it.