I think it depends. For small, fast-writtent rants, txt files are great (my crap-computer-that-is-running-next-to-my-box didn't even burned when the post reached the front page of hn).

I really see the point in not having to manage a whole big ecosystem by ourselves (I use gitlab, sometimes github). The rant was about using an interface on another website (not the email API) in order to submit a PR or an issue for updating a website. It's a standardized way of doing an edit (and it can be painful when you don't know github), and more and more websites are using it.