One thing does not exclude the other. The sites are stateless like Lorddragonfang already said. This doesn't mean you can't make nice client side apps and you surely don't need to use javascript to do it.
What js does is that it allows you to dynamically update the contents of your website like changing an image when you hover over it for example. This is something you can actually do with ALFI by itself without having to depend on a second language like js. I'm glad you asked this question.
>ALFI is stateless so a typical use-case would be to have a regular web server serving ALFI queries as responses from regular HTTP requests (like GET, POST, etc).
