In my experience, most CRUD flask apps end up replicating 80-90% of django projects with 200-300% of the effort. Heck, getting pytest working with flask and sqlalchemy is still a struggle.
ORM, IAM, admin interface, are all included or supported at a decent enterprise-level by Django and will save a TON of early dev hours and rookie mistakes. Remember, this advice is geared at small organizations (startups), which means there is plenty of backend and internal infrastructure required.