[jbjohns]

That's odd. I have been following along here [1] and it seems just as interactive as Svelte, Angular or any of the others I've tried. There might be a few more tools that have to be installed, but that's a one time step.

[1] https://book.leptos.dev/01_introduction.html

[pjmlp]

Still doesn't look like it, this is the kind of interactivity I expect.

https://react.dev/learn/tutorial-tic-tac-toe

Where editing the code, immediately shows the GUI related changes on the neighbouring frame.

While what I see on https://leptos.dev/ is just screenshots, and there is nothing on that documentation you linked that provides the same interactive experience, one has to explicitly start a developer sandbox to host the whole machinery, and even requires a codebox account for editing.