Yeah, it's honestly great. If I didn't already have a foundation in theory, and I needed an instructor to really direct a lesson, it might not be as usable. Meaning, an utter beginner might not be able to call bullshit and/or find it as useful. But with at least a working knowledge of theory and the ability to test its answers at a piano and validate with my ears, I can call bullshit and question the answer if it seems/sounds incongruent. I think the big thing AI products are missing right now are domain specific interfaces. You just have the empty chat entry. It's too open-ended and abstract and people have to use their creativity in figuring out how to use it.
If instead an app had been built to give a musician-specific interface into ChatGPT being a music theory tutor at learnmusictheory.com, it would get a lot more use in this regard. Like an onscreen keyboard to "play" with a mouse to exercise what is being discussed, maybe midi integration to check what notes you played on a synth and give feedback, maybe a Spotify integration to pull up a song at a specific point that illustrates a point of theory, maybe some "learning paths" within theory as starting points to seed the AI discussion for the complete neophyte. Domain specificity with prescriptive workflows. Most people won't even think of ways it can help them because they just see a chat bar.
That abstraction is also part of why it's scary. "Here's Hal 9000, he can help you in every way, will learn from you as it does and may make you so efficient that the workforce doesn't need that many of you." That's a lot more unsettling than, "Here's eMozart, he's going to help you learn music theory."