You misunderstood the problem. The important part is not writing the html, it's writing the text. This solution is centered around the best collaborative/cloud text editing that you can find for free. How does your solution address the scenario in the article of trying to work on the text of a post from a tablet?
For me the Google dependency would be bothersome, but the reality is I still end up using Google Docs for authoring text collaboratively. (At least where Overleaf won't do)
I just don't understand how that's a problem, you can write the text in google docs, and copy/paste it into an html file and stick in the tags if you really want. My point is that going from the content you want, to the static webpage you want is probably 2 minutes work at the very most, and if that's a significant chunk of the time it took you to write the blog, then I'm not sure why you're bothering to write the blog in the first place, just use twitter.
For me the Google dependency would be bothersome, but the reality is I still end up using Google Docs for authoring text collaboratively. (At least where Overleaf won't do)