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
Also, it allows to add more value to your blog at very little effort. If you have someone who comes along and points out another use-case for your information or raises a doubt which you can answer then your blog post has become more valuable.
If your blog is just so you can write what you currently think about things then there is little value.