I understand you. It is an interesting idea after all.
But what I wanted to say is that in The Sims 2, personality didn't affect the career performance at all (mood did that). What extreme personality did however is boost the skill gain in certain skills, so the the personalities brought out helps to gain skills required for the promotion faster.
Of course Nice personality has career affinity with every career because it's easier for them to make friends...
So yeah, what I meant then that the indirect affect on career success from traits is in the future games too. Socially Awkward sims will fail often, making securing votes harder, while Lazy sims need more and longer breaks from exercising, making building fitness skill harder.