I’m glad WP Discourse auto publish is working for your case.
The concern is that folks will come here, read this topic and think “how bad could it be?”. Yes, in some specific cases like yours using auto publish in that way probably won’t cause many issues if you know what you’re doing. However in my experience folks will be creating more trouble that it’s worth by trying solutions within the “bulk publish” rubric. I’ve had to untangle such attempts in the past. As such, “bulk publishing” (which is not auto publishing) is not documented, not supported and not recommended.
Moreover, the alternative, i.e. a database migration, is what most people need when they start to consider “bulk publishing”, however most people have an (understandable) preference for GUI solutions, and an (understandable) aversion to databases, so, in my experience, there is a natural bias to be overcome here. There is actually a simple and supported solution to most people’s problems in this area, if that natural bias is overcome.
If folks want to discuss more specific cases, like yours, they’re welcome to create a separate topic in Support > WordPress.