Pretty much this.
I as an experiment decided to use GitHub pages for my personal website and used some random simple looking theme that appeared on its face easy to manage. It wasn’t. The whole process is annoying, making changes to the site is annoying, adding content isn’t straightforward and if this is how all Jekyll sites are I don’t understand why anyone bothers with this sort of set up
> easily modify content
If you have non-technical users editing a site, this one aspect takes precedence over everything else, and it's there that Wordpress continues to generally obliterate whatever workflow may qualify as "simple" to the average HN reader. If you've never used Wordpress' Gutenberg editor (or others based on the same model such as Medium or Squarespace), you should try it. The ability to not only change formatting but page structure and layout in a guided, template-driven way is simply not comparable to editing a Markdown file.
I'm pretty ambivalent on Wordpress' technical merits and its plugin ecosystem is a terrible attractive nuisance for the uninitiated, but if you want to give content authors a robust tool for publishing, there's not much else like it.