Even if not using a database, I will always reach for Django over a Flask or FastAPI. Yes, there is more boilerplate when just offering a few memory views, but there is so much ecosystem built around the tooling that the expense is worth it. Just making a form or sending an email from Flask requires a third party library which will never receive the level of maintenance as first-party Django. As an example, the often recommended (still mentioned on the Flask Mega-Tutorial) Flask-Mail package last had a commit in 2014.
Fair. I'd probably reach for it too if I had any kind of frontend required, even if that were just HTML and forms. For server-only applications I'd probably go with FastAPI these days and I'm actually looking forward to an all-in-one framework that encompasses FastAPI as the core.
