NotebookLM is one of the most powerful tools available to us today, but it boasts a major, glaring downside: you’re completely locked in to Google, and all of your data is available for review. Even though privacy is implied, it’s not guaranteed. Also, Google doesn’t exactly have the best track record of maintaining projects in the long-term (remember Stadia?) For writers with multi-year-long novel projects, that’s not acceptable.