You can accomplish the same with a mailing list. Users don't even need to create an account; they just click the "mailto:" link at the bottom of your article and type their comment in their preferred client. They can browse the archives for a threaded discussion.

That being said, the best comment platform for a blog is, imo, someone else's blog. If you want to leave a comment, write your own (micro)blog post and send a Webmention.

I wrote about this in another comment: https://news.ycombinator.com/item?id=26043298