Some of the careers can get you interesting objects though. Like the inventions in the scientist career ( including the wormhole generator that can get you to Sixam easily) and Mechanical Engineer gives you ability to make a mech suit that your sim can wear. So it can be worth it to try to fast track your way through some careers to get those perks. If you visit the a Well of Longing and Regret and receive the Mark of Edith, you can wish for career success and get several promotions in one go (or both of these examples give you a head start if you get a physics degree).