Bwonsamdi is a practical fellow. His power relies on having souls. if EVERYONE IS DEAD.. no new souls happen for him to claim. Having life around supports his end goal.
Am I the only one who wants bad moon rising to play for that raid cut scene
I don’t think Bwonsamdi has a problem with using the undead, I think he doesn’t like doing it for extended periods of time. I think that’s the “tipping the scales too far” bit he refers to; she keeps the undead around as servants, soldiers, citizens etc instead of using them as quick, disposable tools like ghouls or abominations