Oh hmm I'm not familiar with Bootstrap Studio, but from what you described, it's quite different because our users don't interact with the underlying HTML/CSS of their sites.

We use React because our editor is built in React (which does have a lot of interactivity and changing states), and so, since it's a WYSIWYG editor, the user will be seeing how their site is rendered as they are editing it, so we render their site in React as well. Also, we are using this React framework, Next.JS, which have a functionality to generate static pages from our React component. At the end of the day the React does get compiled into static pages in HTML/JS/CSS. I'm not sure if this answers your question though, would be happy to answer more questions