That one great thing is arguably also the one horrible thing. The entry bar for plugins and themes is, well, non-existent which results in a lot of sub-par code that makes it onto sites of unsuspecting users. Configurability, while also usually a great thing, is taken to such a level with WordPress that you're often better off designing something catered specifically to your needs instead of loading half a dozen customizable themes/plugins/libraries

> themes available for static sites

By this do you mean plain HTML/CSS themes that you can edit yourself, or themes that are integrated and can be edited within static website providers?

The latter. There are dozens of Jekyll themes, Hugo themes, etc.

the massive number of themes available (and plugins, if you're not a programmer)

and ease of starting with an almost-free "unlimited" shared hosting.

These are the only 2 good things about WordPress.

> I wish very much that there were 10% as many attractive themes available for static sites. Yes, you can port them, but it's a pain.

That's what I always did whenever I needed a website design.

Do you think there’s a market for high quality paid themes for static site generators like Hugo?

I think there's a small market. I've gone looking for high quality hugo themes before. I was willing to pay for one.

I agree. There's a small market. But currently, even though there's probably a dozen or two paid Jekyll or Hugo themes, only a couple are actually attractive, well-designed theme.