Not the point. None of that actually gives anyone a reason to join the Horde or the Alliance. You're only limiting yourselves by allying yourself with one faction and making an enemy of the other.
And even at the end of Legion, Alliance and Horde tension was there and everyone knew there wasn't going to be unity. Nightborne had no logical reason to choose either faction and kind of just put themselves in a questionable predicament by doing so. Vulpera, likewise, didn't. They could've just rode it out and done their thing, waiting for both factions to leave for the next thing.
Acknowledge that the reasons for many allied races joining any faction at all are shoddy.