Not having to know all / as many of the structural details up-front could be of value in some use-cases. It can translate to reducing time-to-start cutting code, which can (in some cases) be a business priority, and can lead to identifying critical dependency problems earlier in development.

I'd happily agree that's an inappropriate model in close to 99% of cases, and that even if it was the right model one could (and most likely should) still use a decent database for this anyway.