Shameless plug:

I wrote my own blog engine in Python (https://github.com/betodealmeida/nefelibata). It generates static pages, but publishes a snippet to Twitter/Mastodon/etc., linking back to the blog post.

People can only comment on the social media sites, and periodically the comments get scraped and appended to the blog post. Here's an example: https://blog.taoetc.org/mastodon_integration/index.html

This way, people can comment in the other venues where they're used to, and comments get persisted past the lifetime of these venues.