The graveyard is also an abstract representation of memories, but also sometimes a literal graveyard for creatures (but not always, since Ajani, Adversary of Tyrants is narratively recruiting a new ally, not reanimating an old creature
This isnt just a set
Second, the current wording is a bit sloppy, as it doesn't literally mean any target, nor does it follow the prior convention of specifying what targets it does mean, so the exposition helps to clarify what the thinking behind it may've been
This is also true for damage spells that have a potential exile clause, like Magma Spray
Honorable Mention #3 - Forbidden Alchemy One of the keys to the Cthulhu Mythos is "Knowledge That Man Was Not Meant to Know." When you find out or see the reality behind the scenes you are likely to go mad with the truth of it, which is something probably coming from Arthur Machen's earlier classic horror short story The Great God Pan which influenced the Mythos