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Question: are static websites so hard to do?
There are several variants of "static website":
* Site is generated by its author, and won't change until author changes and re-generates it.
* Site generates content when something changes (e.g., new comment), not on each page view. (Cf. ikiwiki in cgi mode.)
That said, I would probably prefer embedding disqus or https://muut.com/ comments to running a complex php application just for comments.
The crucial flaw of public comments is that they can be used to address other people than the author; hence spam and trolls for instance. And what's the ratio of actually useful comments anyway? Does it justify the cost of dealing with all the rest (like, say, your blog going down because some comment DB broke which directly hurts your actual readership)?
One-way communication has its advantages, too. Those who really have something to tell you can always use email.
(This is what I wrote for my blog.)