[marcosdumay]

> Some of that is needed, though.

The most important thing you need to make sure is that developers talk with end users. That is one of the biggest point of Agile.

Now, if you look again at the article, you'll notice this one interaction is completely missing. Not only that, but Scrum de-emphasize it too by creating middle-men, and most formal "Agile" methodologies don't even think about it.