Traits matter a bit more than I thought...
I found this article about the clumsy trait in TS4 mentioning that clumsy sims will need more time to get promoted in the astronaut or athletic careers. I tested this statement ingame with otherwise i...
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If you're looking for more of this kind of trait's behaviour you should try traitoverhaul mod by Bienchen (if you're ok with using mods). It does exactly this. Each trait will raise certain skills faster or slower depending on it's nature. Sims with a specific trait will also do better or worse at certain careers.
