You will never get the chance to sit and talk with your now-elderly tutor, in the future, and tell them how much they helped you, or pay their deeper contribution forward by tutoring someone else.
Your AI tutor also doesn't know a job you should apply for, or a local group you could join for your other hobby they now know a lot about, or… or…
I mean the list of intangibles goes on and on, doesn't it? But here at HN people like to disrupt.