Even with all the hours players spent in the Shadowlands alpha and beta tests, you can't entirely see the impact of some game systems until the entire player base has a chance to explore it.
In Shadowlands, the Night Fae Covenant shows us the mirror to the Emerald Dream and the darker half of the Wheel of Life.
In Shadowlands, the Necrolord Covenant is considered the military might of the Shadowlands and protects it against external forces that wage war against the enemies of Death.
In Shadowlands, the Kyrian Covenant is all about righteousness, valor, and humility, while giving us fluffy owl buddies and wing transmogs.
In Shadowlands, the Venthyr Covenant is all about punishment and atonement.