>>Yes, it was an unreasonable choice. This is basically saying that the cool kids are using document stores, so we should too. There is no discussion of require

>>Yes, it was an unreasonable choice. This is basically saying that the cool kids are using document stores, so we should too. There is no discussion of requirements... You hit the nail on the head. I posit that this problem is caused by the Agile mindset that says "we don't need to collect or discuss requirements upfront. They change too often! Instead, we will just start hacking and change things as we go along." Two years later, the team is running into all kinds of complex, hard-to-reproduce problems, and they realize that they have made a terrible mistake picking MongoDB and they have to undertake a very painful migration and rewrite of the backend.