That’s right, it’s good at things that are common. If your job is mostly filled with uncommon tasks, it won’t be good at helping you.
But for the rest of us, who have a mix of common/boring and uncommon/interesting tasks, accelerating the common ones means spending more time (proportionally) on less common tasks.
Unfortunately we don’t seem to great at classifying tasks as common or uncommon, and there are bored engineers who make complex solutions just to keep their brain occupied.