Allegedly, the Trait system as is currently implemented is only a placeholder. It also only gives you a bonus with the first point, and no subsequent points do anything unless it cancels out the first bonus
(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.
But since that was two months ago and there's been no news since, and the only change was now there's a shiny bar showing which Trait is dominant, maybe that was cut too.