To be fair, static blog generators have been around for years, and their use is hardly a fad, considering the number of blogs that people host on github etc.

It hasn't caught on as much among non-tech types, but it's certainly not a fad, and the solutions are mature, usable and open source. I can understand wanting various features that only a dynamic blog offers (like commenting without Javascript), and I run such a blog myself.

Using Wordpress to generate a static site is a useful thing, too. Improves both the security and the speed.

There's a whole pile of caching plugins for it, too. I can't speak to their relative quality, though; I just stuck Cloudflare in front of my site and called it a day. Perhaps I will come to regret that.