As good as they are, they are still fallible. They still write bugs, they still misunderstand instructions. They even get defensive about bad choices! And even in a world where that appears to no longer be true, we will be making society extremely fragile if we give an alien intelligence total autonomy to do what they think is right.
If you're not going to be writing code, you better be a vigilant babysitter. Otherwise I firmly believe that more than your job is at stake.