Note-taking and publishing are different enough to deserve being separate apps, especially when the notes can contain private material.
I touched on the example of a blog in the article in the context of E2EE, but let's forget about E2EE for a second and just look at it from a stale data perspective: you click the share button in Joplin and publish to the blogging app of your choice. Later a reader on the blog points out a few typos so you make some changes in your blogging platform. Now you have a version of your blog post on Joplin that is stale unless you manually copy-paste your changes from the blogging platform back to Joplin. Or you make the changes in Joplin and need to manually republish to the blog somehow.
But what if instead your notes app was a single source of truth and making changes there automatically propagated everywhere you needed – whether semi-privately in the Supernotes collection of a friend, in a shared Notion workspace with your team, or published to the broader internet. That's (one of) our goals with Supernotes.
come on, now.
Note: I run a paid 3rd-party synchronization service for Trilium Notes that would offer the publishing part of what you mentioned easily, without setting up a cloud server: https://trilium.cc/
Use case - I want to keep some notes for myself e2e on my laptop & phone but every now and then I'd like to publish a few of them under a pseudonym anonymously on the internet.