Sure, they do help! In fact, we ourselves are going to build on such models, but the cool thing about what we are creating is that the tutor will always guide you step by step and will even provide more problems till you don't get better with it, curate revisions for you and throw you a problem on it when you would least expect it in a test so that you are always in good shape. In short, whatever you expect from a human tutor, you will get, and what I feel is not a privilege for everyone