Where is this strong reaction to over-design coming from? Full disclosure: I earned most of my salary in 2012 doing consulting. Fortunately, most of it was from working on open source projects. But a component of it was going in and getting our hands dirty in clients' apps.

Not a single one suffered from over-architecture; indeed, the common thread to all of the problems I saw is that people would intentionally put off the "just in time" architecture improvements that DHH recommends in favor of just one more feature.

By the time we got there, the whole thing was about to collapse under its own weight.

And that's exactly my point: this seems to be a solution in search for a problem. Under-architecture is much, much more widespread of a problem than over-architecture, based on my own anecdotal experience and the horror stories told by my friends over beers.

Software engineering is about striking a balance between choosing an architecture that can grow with your project while being simple enough for you to ship features today. The dogmatic approach from both sides in this ideological war is bizarre. Remember that prescriptivism against prescriptivism is still prescriptivism.