The article is a little overenthusiastic, but it did strike me while this was happening that something new was going on. I'm very familiar with the model in which changes to a web app get pushed out quickly. But this felt different because (a) it was the result of a conversation with the users while they were using the site, and (b) I typed the changes into the repl of the running server, iterating through design options (and debugging) on the fly. These changes are still not released; if the server crashed and restarted, they'd disappear. (I saved them to a file on my development machine, and the server crashes rarely enough that I'll almost certainly release the latest version before that happens.)