Warcraft has a lot in common with DnD, it takes its roots from it.
There are monks in DnD and they are thematically similar to WoW monks - Chi energy, martial arts and stuff. Yet, there are a Warforged in DnD - a race of literall robots. And they can be monks. Because they have souls.
Chi is more like a soul energy, I think. Mechagnomes have souls, just like Forsaken have souls.