No, I'm asking why ChatGPT isn't sufficient because they literally do the same thing unlike Dropbox vs rsync. In other words ChatGPT has the same UI UX but people flock to Muse for some reason.

You clearly didn’t understand what Muse is if you think it’s the same. Do you understand “always on”? Try to learn what that means, so you will understand why ChatGPT chat is not that.