To me, the core appeal of the horde, and something that’s been advertised about them by Blizzard, was them being a group of monstrous races that were prejudiced against by normal races. Outcasts who find a home and family among each other, by inverting typical fantasy tropes where you’re not a villain just because you’re playing a monster race.
Calia has never been needed for the forsaken, or the horde as a whole, to progress in their stories. On the contrary, her forced inclusion robs the forsaken of agency of improving on their own via homegrown characters that feel like they came from their own faction, instead of the story “gifting” them from the alliance.
The game should have gone with the forsaken learning to control their own decay. Or in some instances, maybe it’s actually fine for some of them to succumb. The forsaken are a tragic race, after all, and those aspects of trauma, degenerative mental illness, loss of family and faith, and learning to deal with it (NOT cure it) is just as much a part of them as being zombies are. Calia is detrimental to that story, not an accessory to it. Because as long as she’s getting narrative focus, that’s time spent that isn’t being given to literally any forsaken NPC that could’ve been expanded on instead.
The story isn’t just some book we’re reading. These races and characters are intended to represent their fans just as much, if not moreso, than them simply existing for their own sake. And if most forsaken fans dislike Calia, then no amount of her helping the forsaken mends their immersion in the game.
From what I understand, the problems night elf fans have with the story is completely different. Theirs is a loss of efficacy, of feeling like they’re the super strong amazon warriors from WC3 that they believed they were rolling. This extended nonsense with the new world tree seed doesn’t help that. What they need is blood. And the only “interest” I’ve seen from anyone regarding the seed is hoping that the game finally puts the Teldrassil storyline to rest, because people are sick and tired of it. I wouldn’t call that good storytelling, either.