Notes and articles have different audiences: I write my notes primarily for myself, but I write articles primarily for others to read.
Articles are more structured than notes. Articles have an introduction, a table of contents, delineated sections, etc. There is a XML feed for my list of articles, but not for notes. (Weeknotes are an exception.)
Notes have fairly free-form content. Notes are atomic and often address only one idea, while articles connect multiple ideas together in longer-form writing.
To figure out: Articles can go into a feed, which will be chronological. How does that rhyme with my thinking that Short-form content doesn’t need to be written as a chronological sequence of blog posts?