This isn’t exactly true. The Django ORM can be used with care in the async views found in FastAPI and Django (see sync_to_async and run_in_threadpool helpers).
Plans exist to make the Django Queryset async, so it’ll be exciting when that day comes!
So far they are only going down the the queryset level, it then uses a thread pool for the db connector, next job would be to support async db connections.
Full support for Django and particularly it’s ORM (hard to do with FastAPI as the Django ORM is not yet async and can’t be used with FastAPI)
Will edit to make clear.