Heck, my Wordpress blogs are faster than when I had static sites on shared hosting.
In other words, it does precisely what you're saying it should do.
1) it's more fun
2) it's good practice as a programmer
3) you get complete control over what content is generated (i.e. can minimize CSS/JS size)
4) you get complete customization - you can make your own way to template things that is convenient for you, or auto-import a particular file format you like to keep for your notes on disk, etc
5) you don't have to learn how to use wordpress
(It's not to say I think using wordpress is bad - if you like it, use it!)
> you add your name, a bio, some links, and Gatsby does the rest.
>
> But that comes at a cost. And that cost was made clear by me hunting the favicon file
It is great for non-technical people, but the risks are high.
I personally find that github pages is a better alternative now: most users can handle doing edits in github's web UI, and on commit the changes are auto-deployed to the live site and appear within 60 seconds or so. And it helps me to see their git history when they screw something up.
I have a series of content websites, and at first I used Jekyll and it was fast to load, but everything took 10x longer to do than just using WordPress.
I now use WordPress on a VPS and served with Litespeed Enterprise and the performance (read: load times and CWV/GMetrix scores) is very very good - better than static sites hosted on shared hosting, in-fact.