more of a Python person here, but in the python world its really similar. People feel like their service is too small / not a good fit for django and build Flask services. I like Flask, its really nice. But no 2 Flask services do look remotely similar, after 4-5 weeks the services have pulled in so many plugions that they might have just used Django or similar larger frameworks.

Sometimes people don't like to use Django because they write fairly stateless services not involving a database, its understandable but that aspect "doesn't eat much hay" tbh.

As a middle ground I often recommend https://trypyramid.com/ which has more structure, a better plugin-integration infrastructure than flask but isn't so much bound to a SQL ORM (while you still can use sqlalchemy just fine).