Why does the D&D game system treat the pantheon as disparate?

Is there a word for the feeling you get as DM when you’re not sure where the story will go next?

Here are the Sorrowsworn concepts

How does Larloch feel about Acererak?

How about a bunch of concept sketches from Mordenkainens Tome Of Foes?

Ed’s lich

Perkins is going to make me pronounce D&D terms properly because he is a narc