Why? Because it takes too much maintenance (keep it up to date ornbecome part of a botnet) for features you probably don't need. A static site generator is totally fine for most blogs and if it needs maintenance it is at a time of your own choice.
My update process is:
- Click a button to back up
- Click a button to update everything
- Open my blog to make sure it still looks normal
Definitely not onerous. To be fair I don't use many plugins, and my theme is very simple. I don't think a plain old blog doesn't need many plugins.
Sometimes I take a break from blogging. I don't want to have to read documentation on how my SSG works (either my own docs or docs on some website) to remember the script to generate the updates, or worry about deploying changes, or fiddling with updates that break my scripts, or anything like that. I do stuff like this for my day job.
I like my blogging experience to be focused on a single thing: writing.
Not a thing you'de need to do with a static website. If you're like: "Hey, I am not doing it right now and I am fine", consider that your warning. I have been hosting wordpress instances since wordpress existed and I know how things can go wrong with them.