Hi Mike, there are a couple of reasons. The biggest one is since phpBB is so popular it is a frequent target for automated attacks by spammers, I'd rather not have to deal with that if possible.

Also I'm not really a fan of the whole "single page" type layout. With phpBB the list of topics and the discussion thread itself are on their own individual pages. That means you have to navigate back and forth quite a bit.

That's rather annoying, it is nice to have the list of topics in its own frame on the left so that it is always available to browse through and click on any particular topic without navigating back and forth.

- Michael