I think we all look back fondly to the early days of HTML sites where everything was pure, but let's not fool ourselves into thinking it was the best setup for things like blogs. If you want to be a purist, do so by leveraging newer advancements like web components. Suggesting people copy and paste HTML/CSS for every post is a really bad suggestion for anything that isn't a weekend project that you will never touch again.
And also, isn't a HTML IDE the equivalent of a static site generator except lacking any of the actual features that make generators appealing?