It doesn't matter if it's complex. I believe this tool can be applied if it consists of a single HTML file and the resources linked to it. If you're using Web Components, there may be some issues. JavaScript is currently disabled because it's difficult to determine its impact, but enabling it is technically very simple. If there is enough demand in the future, I will add an option to control the functionality of JavaScript.

Why do you fantasise about writing pure html manually for an entire website? Haven't you done it before?

Because I don't understand the template language used by Hugo. The syntax is weird, using features is complicated. Everytime i thinking of changing something in my site, it feels like PTSD thinking about touching that code.

If it was just html, I could modify it easily. But doing big structural changes in many html files is as painful. Visual tools, like this one should help with that.