New technologies always bring new opportunities, but also new problems and challenges, for which we want to continue expressing our words and thoughts. Now, with the competition from these AIs, some users fail to see the harm they cause by not engaging their brains and instead relying on the convenience of someone else doing their thinking for them.
In the end, what may end up happening is that the person doesn't exercise their brain, doesn't create new connections, and will be more prone to the effects of dementia in the future.