Yes? A blog post is a commitment; you write out a bunch of text, and then you have the option to polish and edit it, so there's generally the expectation that you'll polish and edit it. But you don't want to do that, so you just write the blog post (or half the blog post) but never publish it.
On Twitter, you can just write half an unedited blog post, and then stop; and people will still derive value from that.
It's a very bold assumption to expect the exact same structure in a blog post (which can be edited at arbitrary places within the entire document) than in a twitter thread (where tweets can not be edited once sent). Editing - or not being able to edit, for that matter - has a massive influence on the eventual resulting text.
In fact, the incremental nature of twitter threads kind of caters to the ADHD brain because it completely defeats self-sabotaging perfectionism by removing the opportunity to revisit and rework previous sections of the text. If you follow Foone for a while, you'll see that they tweet their thoughts and works as it happens. They don't sit down and prepare the entire thread beforehand because doing so would make it a lot harder to finish, if not entirely impossible.
Twitter is a better medium for this kind of thing.
Writing many short pieces of content asynchronously and being able to GC them from your mental stack whenever you need is objectively a very efficient way to publish.
It's important to remember that not everyone's brain works the same as yours - for some people it's quite transformative to be able to document thoughts atomically.