I definitely will be very upset if the AI personalities won't be implemented, but Swen has said in recent videos that they will be.
I know why they're holding back on the AI personalities, though.
(Trait) Bonuses for Conversation are AmbiguousWe'll be going through the traits system shortly and you can expect changes. The assignment [of] boni so far was rather arbitrary and served more as a test of the dev pipeline. Your points are very valid btw & reflect the original vision more than the system as is.
The personalities are supposed to reflect a character's Traits, and because the current Trait system is basically a placeholder, they need to change the Trait system to be better before it makes sense to add in the AI personalities.