[CuriouslyC]

I view it from the other direction. If you aren't using the ORM, or the templating engine, or the admin interface, why would you choose Django? If your answer is for a plug-n-play RESTful api or authentication, you might want to check out PostgREST with PostgreSQL 9.5's row level security features, it's just plain better.

[simonw]

Because at that point, Django is a superset of Flask. It can do everything Flask can do, but it also has additional access to the Django ecosystem of tools and libraries.