I think I am wrong on multiple accounts here, but I'm just gonna go ahead and riff anyway.
The Shadowlands is the realm of Death, right?
The Emerald Dream the realm of Life, or?
Ny'alotha the realm of Shadow? (I guess "Shadowlands" was taken so they went with something more exotic I suppose)
The Twisting Nether is the realm of Disorder?
Then certainly there exists a realm of Order and one of Light, too.
If the beings of Disorder (Demons) go to the Twisitng Nether when they die, and mortals go to the Shadowlands, does that mean that mortals are beings of Death? Is Death our team, that we are supposed to be playing for?
Night Elves used to be immortal. What if they were immortal because they are are beings of Life, the reason wisps exist is because they are beings of Life, so they don't go to the Shadowlands, they go to the realm of Life, as wisps. (I'm sure somebody can poke a pin into this whole thing by pointing out a dead Night Elf character that I don't know about that will be appearing in the Shadowlands.)
But wait, if they go to the realm of Life as wisps, and they stay in reality, doesn't that conclude that reality is in fact the realm of Life?
But what about the Emerald Dream? Didn't the Titans, the beings of Order, build the Emerald Dream? They created Freya who supposedly built it. Their lieutenants in the ordering of Azeroth is the Dragonflights, they are aligned with the Emerald Dream. Wouldn't it make sense that the Titan's lieutenants are beings of Order too, not Life? Is the Emerald Dream in fact the realm of Order? (Probably not since they already did the Cosmic Chart, but why should this stop me from speculating?)
So there is no neutral ground called "reality". There are 6 primal forces, each with their own realm, and reality is one of these 6 realms, or planes of existence. Everybody is playing offense and and defense on each others' turfs all the time.