| Tggdan |
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This came up in a muntants & masterminds campaign- a PC was immune to "interaction effects" and the GM would not tell the player any dialogue. "The NPC seems to want you to go fight this other guy". The justification was that word choice and inflection was an interaction effect and thus your character can literally only understand vague intent and can never be "convinced" by anyone to do anything.
As far as biology vs soul- the system seems to separate intelligent creatures from unintelligent creatures. Vampires "fear" mirrors, holy symbols, and fire. You might be able to threaten a vampire to release his victim by threatening to pull the curtains and flood the room with sunlight. Even a fearless halfling or paladin can understand and try to avoid undesirable consequences.
It seems like these immunities are meant to make them immune to mind effecting special abilities, not to make them immune to all interactions. Unintelligent undead cannot be coerced by virtue of being unintelligent. Intelligent undead may seek revenge for being controlled- but that's an emotion, right?
Certainly they can have agendas, personalities, and can understand the difference between how things are, and how they could be, and can desire certain outcomes over others. D&D vampires (like Strahd) are known to have "loved". Ghouls are always "hungry". Anything intelligent can have some measure of emotion- those emotions just can't be magically manipuated.