I want to know how the mechanics work. Is there a quickstart or something, or are people just supposed to know what they mean when they say, "uses the Year Zero Engine"?
Come on. You know the reason. I and others have explained it more than once. You just don't agree with it or like it, because you're coming at it strictly from a rules-based, mechanical perspective.
The pacts and the invocations, many of which are associated with them. Would you just rename them so you can keep the mechanics the same? I don't think that would work for me. I said similar mechanics to the warlock, not identical.