foone has ADHD, and can't complete a blog post because of that. Asking them why they don't just write a blog is like asking a blind person why they don't just read normal text instead of braille, they literally can't.
I think literally can't is a little bit strong here, as Foone does also have a blog: https://foone.wordpress.com/
That being said, if using twitter is easier for them and it's a choice of either publishing this stuff on Twitter or not at all, then I'm glad they use Twitter.
Edit: I just noticed that the blog posts were originally published as twitter threads, so maybe my point doesn't stand.