The same can be said about people being reanimated following death by some mysterious preternatural force.
That's true. However the difference for me is that the show stays consistent within the parameters of the fiction. In WD's case - the only thing that's is abnormal in this world is the dead reanimate - everything else within this fictional world is as we would expect.
A great example is in Trek when they would use the time travel reset button to solve continuity problems within the plot.
One of the best examples in Trek and worst episodes in all of the series was the Voyager episode Threshold
where they break all of the basic rules established within the fiction itself through many different shows, movies, etc.