What theme are you using with Docusaurus? The classic theme (default). I am curious what you are seeing that is Facebook-specific that you are cleaning up. Would love to hear the feedback. Thanks!
You can definitively remove it ("blog: false" in preset config).
If you remove it, you also need to remove the links to the blog, because it would lead to 404 errors.
Docusaurus is fail-fast by default and try to prevent you to deploy broken sites, I understand how it can be annoying in some cases but consider it an useful feature
I'll give it another shot and see if I have the same feeling, if so I'll write a feedback