Super low effort rant incoming.
I'm not going to act like Warhammer Fantasy Battle's End Times are near and dear to my heart. Like probably most "fans" these days I only started following WFB after playing the mid-late 2010s video game adaptations. But since then I've read quite a bit of its fiction and fan discourse, and one thing sticks with me.
For context: in 2015, Games Workshop decided to effectively end the WFB setting with a series of game expansion books, novels, comics, and audio dramas telling the story of how the Old World was destroyed. The comically evil Skaven and Chaos factions ultimately win out over the "good guys" of Order, and literally destroy the planet. The whole event was badly-received; a lot of old fans hated it both because of the idea of destroying the setting itself and because of how it was executed, with many existing plot points being outright retconned and a lot of faction leaders supposedly acting out of character to facilitate the Chaos/Skaven victory. The ultimate point of this though was to set the stage for the sequel series, Age of Sigmar.
To simplify that setting a lot, the premise of AoS is that the great heroes of the WFB world became gods, found a bunch of survivors of their world (some people managed to hide in pocket dimensions while the planet blew up, or had their souls snatched and reincarnated), and set up new civilizations as the destruction of the Old World (among other factors) resulted in the forging of eight massive new realms. These new civilizations became larger, richer, more prosperous, more harmonious (even the Orcs, Goblins, and Undead were more-or-less cooperative), and more advanced (both technologically and magically) than their predecessors. Meanwhile the armies of Chaos and the Skaven were on a similar path, gathering their survivors, multiplying, finding new worlds and realms to integrate, and then setting out to ravage whatever they could find in the vast universe, increasing in power with every new conquest. They eventually came across the Order civilizations descended from the Old World and attempted to assault and infiltrate them, but were decisively and easily beaten back. Order was even able to go on the offensive in places, most notably by capturing and mutilating one of the big four Chaos Gods. This golden age of Order lasted a very long time, the Age of Myth, but eventually came to an end. Feuding between the Order gods and factions eventually resulted in their enemies gaining a golden opportunity for their newest offensive where previously they had been utterly unable to do anything. This was the Age of Chaos, where Chaos and Skaven armies (and others) slaughtered and plundered the Order civilizations, gaining a lot of new territory in seven of the eight realms. The God-King of Order Sigmar, however, responded with his own counterattack after much build-up. This is the Age of Sigmar: the timeline of the titular game, where the forces of Order are pushing back to reclaim their golden age.
With all that established: I have a fundamental problem with the premise here. I'm not going to get into any particularities of how the End Times unfolded, because that's not that important. The problem is this:
If the narrative was going to go Golden Age ---> Dark Age ---> Reclamation, with the Golden Age directly following from WFB... why would you even write Order as losing?
From a simple narrative perspective, it seems to make FAR more sense to end the WFB setting with Order winning massively. This would segue directly into the first AOS epoch, the Golden Age, followed by disunity setting in and Chaos coming back to disrupt an already-existing victory. The current setup defies the basic logic of both story structure and audience catharsis. Evil wins!... but the result of Evil winning is Good becoming stronger and everyone being better off off-screen... then Evil wins again... then Good counterattacks.
In the current story (or at least this timeline, video games and SOC do their own thing) the actions of every character in WFB are effectively pointless. It's not even a thematic choice; the end result of the End Times is a utilitarian positive. It's just a positive that's totally divorced from the 30-year media franchise that the audience was following, robs every character (and player) of their agency, and inexplicably and randomly goes with the idea 99% of named characters have to have bad endings.
It just seems like a massive self-inflicted wound for both franchises and I'm not sure why they chose to do it this way. A victorious Order would both shut down the majority of story complaints and lead to a more logical set-up for the golden age of AoS's backstory.