Yes! We are still a few days away from releasing bulk entity upload from the frontend. Even when doing that is possible, there will still be cases in which it's convenient to automate entity creation in this way. Note that you can do updates in a very similar way using the update endpoint.
We're always interested in learning more about how projects are making use of ODK broadly but particularly entities since they are in very active development. Consider taking a moment to introduce yourself and describe what you're working on!