I was using Python's Pelican static site generator for some time until I wanted to further customize the template fragments of a theme. Started running into issues and even helped fix a bug with the build command. Eventually I couldn't be bothered and wrote my own static site, except with Nextjs instead of plain HTML. Didn't take long and I don't have to mess around with awkward jinja templates anymore.

Similarly I started out with Pelican but eventually needed more fine control over the site using MDX/etc. so I migrated my site over to Astro and have been pretty happy with it.