It seems like one of the key events that needs to happen for any professional domain to take off is for it to develop an "inside" language that nobody else understands. For example, I still don't know what a kanban or a scrum is. So I'm very ill positioned to challenge their use or question how they are done. Hence they got to dodge a whole lot of opposition that would probably have brought it all down. The invention of a new mysterious terminology I think was critical for agile to take off.

The problem with this phenomenon is that the same freedom from critique that is seemingly necessary for new domains to establish themselves also detaches them from necessary criticism. There's simply no way to tell if this isn't a load of baloney. And by the time it's a bullet point requirement on CVs to get employed it's too late for anybody to critique it.