I am really interested in the 'buggy'ness of WP. Especially when you basically would be served with a static website, I do wonder which 'bugs' in WP are annoying you so much.
May be I stated it wrong. But here are some of the problems I face in WP:
1. Sometimes the backend is quite slow. Can be an issue with the hosting.
2. I think there are too many options for me. I want something simple like Hugo!
3. In the past, I have ran wordpress sites and they tend to become slow over time. May be this can be solved with better plugins and hosting!
The point is there are too many things in wordpress that I don't want!
your WP concerns sound similar to mine. I ran a WP site for years locked it down server ran fine but upgrades and maintenance required setting up a local dev environment etc not always possible when I don't always have a personal machine to work on. I found the perfect solution in something like WPEngine you literally just worry about the wp-content folder and thats it - but it comes at a cost and a cost I'm not willing to pay for a personal site that is updated once every few months and visited even less!
I ended up moving from wordpress to static (eleventy) on netlify and now I'm looking to go back to wordpress! I tried the blogging from markdown files on my phone/tablet but I miss a good old (non gutenberg) CMS! (plus shortcodes are super handy and theres plugins and code for everything!)
Not OP, but maybe the new over-designed/over-engineered Gutenberg UI may feel slow, overkill and may only brings loads of unnecessary complexity, especially for someone who want to keep a simple blog, or is used to write his posts in simple markdown.