Just think of AI in its current chatbot form as an advanced form of autocomplete. You need to supply the inputs.
It's merely the next level of writing assistants. I'm not using chatbot now, but I am using Grammarly. It's checking my spelling and word usage in real time as I write.
It's passe to think of writing as a stream-of-consciousness from mind-to-hand activity. Since the 1980s, word processors have turned good writing practices into something better described as processes of successive revision.
A chatbot lays down some grammatically correct wording for you. It gets you started, but it's up to you to make it better. Change the wording here and there as you see fit to make it your own.
Again, if I were to start a large project, I would be doing it with help from AI, just like I use Grammarly when writing brief emails.