lol be serious. it's because the more options you have for character alignment, the more work you have to put into the game. having a spicy blood magic option means thousands of hours of extra coding to have unique dialogue, animations, story alternatives, ect ect and that's just a waste of money for this famously unethical company. they're trying to get ahead of comparisons to baldur gate 3 with it's fleshed out alignment paths. "our hero wouldn't do that" sounds better than "we didn't want to pay devs."