Historically, tools extended human capability. The expectation was always that humans remained responsible for the outcome. What's new is not that AI helps us think. It's that many people seem increasingly comfortable letting it think on their behalf.
Tools can also dull human capability. Calculators made it less important to be able to do math in your head. But how many people are pulling out their calculator at the grocery store or in other everyday situations where it would be helpful but not crucial? Now imagine this effect but for general thinking and creating.