I use Hugo to run a site for a small news organization. It’s flexible enough. I’ve never run into something I couldn’t make it do with some creative thinking. It doesn’t have any plugins because why would it need a plugin? I guess there is a basic build and an extended build for including image resizing, but they would only have one build if they didn’t need to use C for the image stuff. Plugins mean the system doesn’t solve the problems of its users…

It does have themes, but I just write my own.