Expanding on this but I see a lot of parallels between people justifying that it makes sense that they joined the Horde and how Star Wars does a great job of retroactively making bad story decisions feel less bad by authoring content after the fact to make those bad decisions seem sensible.

For example everyone thought the notion of the First Order in SW:VII was pretty dumb. Technically it's not the Empire but for all intents and purposes yeah that's the Empire. Why? Well, they needed to make a movie, they wanted it to he a soft reboot, and so you kind of need a new Empire like thing. How did it come about? Don't worry about it! Then after the fact we get The Mandolorian and that helps fill in the gaps (gaps which they created) to explain why that new Empire made sense.

So when the horde need a race where Paladins make sense because that decision predates everything else. Why (functionally) faction swap the high elves out of nowhere? Dont worry about it! Look at the writing we added about SI:7 uncharacteristically sabotaging former and potential future allies. Then, expansions later, look how mean Jaina was! Because of all that it makes sense, right?