My opinion being able to purchase a cheap priest to summon Ghouls isn't all that important. The only nation that can do that now is BE and that's fine by me.

How would it add more variety?

It certainly doesn't make it more lifelike. But it makes it more lifelike than one that has a Huge Popkilling dominion like CW, AE, and SG so that if you take any positive scales you are signing yourself to unefficent use of points.